Fever In The Immunocompromised PatientAPPROACH

INFECTIOUS DISEASE AND FEVER SYNDROMES · 19 SECTIONS

⚲

589 items

☷ Legend

⚲

Resuscitation and Universal Approaches9▾

Chest and Cardiovascular12▾

Respiratory11▾

Abdominal and Gastrointestinal24▾

Renal and Urinary7▾

Neurologic11▾

Back and Neck8▾

Women's Health, Pregnancy, and GU11▾

Infectious Disease and Fever Syndromes11▾

Fever In The Immunocompromised Patient Fever With Rash Animal Bites And Rabies Risk Assessment Tick Exposure And Tick Borne Illness Concern Sepsis Concern Without Clear Source Soft Tissue Infection Concern Abscess And Skin Infection Concern Sore Throat Sore Throat And Pharyngitis Symptoms Meningitis Envenomation And Bites

Allergy and Dermatology7▾

Musculoskeletal and Extremities14▾

Trauma and Wounds14▾

ENT, Eye, Dental10▾

Endocrine, Metabolic, and Abnormal Labs9▾

Toxicology and Behavioral14▾

Pediatrics16▾

Environmental and Exposure4▾

01History/hx79

Immunocompromised context

›Host defense status

›Neutropenia

›ANC less than 0.5 x 10^9/L

›Expected ANC less than 0.5 x 10^9/L within 48 hours

›Cellular immunodeficiency

›Solid organ transplant

›Hematopoietic stem cell transplant

›Humoral or splenic dysfunction

›Asplenia or functional asplenia

›Hypogammaglobulinemia

›HIV status

›Known CD4 nadir and most recent CD4

›ART use and adherence

›Immunosuppressive therapies

›Systemic corticosteroids

›Biologics

›Chemotherapy

›Other immune risk states

›Cirrhosis

›Chronic kidney disease

Fever details and timeline

›Symptom chronology

›Time of first fever or chills

›Course

›Persistent

›Intermittent

›Recurrent

›Highest measured temperature and measurement method

Infection focus and symptom clusters

›Localizing symptoms

›Respiratory

›Cough

›Dyspnea

›Pleuritic pain

›Gastrointestinal

›Abdominal pain

›Diarrhea

›Odynophagia

›Genitourinary

›Dysuria

›Flank pain

›Pelvic pain

›Skin and soft tissue

›Rash

›Pain at catheter site

›Neurologic

›Headache

›Confusion

›Neck stiffness

Exposures and context

›Exposure history

›Sick contacts

›Travel

›Within 30 days

›Endemic exposures

›Animal exposures

›Cat scratches

›Bird or bat exposure

›Food and water exposures

›Undercooked foods

›Unpasteurized dairy

›Environmental exposures

›Mold or construction

›Freshwater exposure

Prior care and antimicrobials

›Recent healthcare encounters

›Recent hospitalization within 90 days

›Recent ICU stay

›Recent antibiotic exposure within 90 days

›Prior cultures and resistant organisms

›MRSA colonization or infection

›ESBL history

›Carbapenem resistant organisms history

Devices and portals of entry

›Indwelling devices

›Central venous catheter

›PICC

›Port

›Urinary catheter

›Ventricular shunt

›Recent procedures

›Dental

›Endoscopy

›Biopsy

02Alarm Features/alarm49

First 5 minutes and escalation triggers

›Immediate escalation criteria

›Hypotension

›SBP less than 90 mmHg

›MAP less than 65 mmHg

›Hypoxemia

›SpO2 less than 92 percent on room air

›Escalating oxygen requirement

›Altered mental status

›New confusion

›GCS less than 13

›Respiratory distress

›RR 30 or higher

›Use of accessory muscles

›Shock physiology

›Lactate 4 mmol/L or higher

›Cool mottled extremities

High risk immunocompromised syndromes

›Cannot miss syndromes

›Febrile neutropenia

›Fever with ANC less than 0.5 x 10^9/L

›Treat as sepsis until proven otherwise

›Central line associated bloodstream infection

›Fever with indwelling central access

›Local catheter pain or erythema

›Meningitis or encephalitis

›Headache with fever

›Neck stiffness

›New focal neurologic deficit

›Pneumonia with hypoxemia

›SpO2 less than 92 percent

›New infiltrate or respiratory symptoms

›Necrotizing soft tissue infection

›Pain out of proportion

›Rapid progression

Dangerous vital sign patterns

›High risk vitals

›HR 130 or higher

›RR 30 or higher

›Temp 39.5 C or higher

›SBP less than 90 mmHg

›SpO2 less than 92 percent

Immediate consult activation triggers

›Early specialty involvement triggers

›Hemodynamic instability

›ICU

›Critical care

›Febrile neutropenia with instability

›Oncology

›Infectious diseases

›Suspected invasive fungal infection

›Infectious diseases

›Hematology oncology

03Medications/meds39

Immunosuppressants and infection risk medications

›Immunosuppression profile

›Systemic corticosteroids

›Prednisone equivalent 20 mg daily or higher for 14 days or longer

›Recent pulse dosing

›Calcineurin inhibitors

›Tacrolimus

›Cyclosporine

›Antimetabolites

›Mycophenolate

›Azathioprine

›Biologics

›Anti TNF agents

›Anti CD20 agents

›Chemotherapy agents

›Last cycle date

›Nadir timing estimate

Antimicrobial prophylaxis and adherence

›Prophylaxis

›TMP SMX prophylaxis

›Pneumocystis prevention

›Missed doses

›Antiviral prophylaxis

›Acyclovir or valacyclovir

›CMV prophylaxis

›Antifungal prophylaxis

›Fluconazole

›Posaconazole or voriconazole

Medication interactions and contraindications

›Interaction traps

›QT prolonging combinations

›Fluoroquinolones

›Azoles

›Nephrotoxicity combinations

›Vancomycin plus piperacillin tazobactam

›Aminoglycosides

›Serotonergic agents with linezolid

›SSRIs

›SNRIs

›Allergy history

›Beta lactam reactions

›Prior anaphylaxis history

04Diet/diet15

Hydration and intake

›Intake pattern

›Poor oral intake

›Vomiting limiting intake

›Diarrhea limiting intake

›Hydration indicators

›Reduced urine output

›Orthostasis symptoms

Food and water exposures

›High risk exposures

›Unpasteurized dairy

›Undercooked meats

›Raw seafood

›Well water

Substance exposures relevant to fever mimics

›Exposures

›Alcohol withdrawal risk

›Stimulant use

05Review of Systems/ros28

Constitutional and infection symptoms

›Systemic symptoms

›Chills and rigors

›Night sweats

›Weight loss

›Fatigue

Cardiopulmonary

›Cardiopulmonary symptoms

›Chest pain

›Dyspnea

›Cough

›Hemoptysis

Gastrointestinal and hepatobiliary

›GI symptoms

›Abdominal pain

›Diarrhea

›Nausea

›Jaundice

Genitourinary

›GU symptoms

›Dysuria

›Frequency

›Flank pain

Neurologic and ENT

›Neuro ENT symptoms

›Headache

›Photophobia

›Neck stiffness

›Confusion

Skin and musculoskeletal

›Skin MSK symptoms

›Rash

›Joint pain

›Focal limb pain

06Collateral History and Family History/chafh13

Collateral reliability and supports

›Collateral sources

›Caregiver report

›Pharmacy reconciliation

›Oncology transplant clinic documentation

›Support reliability

›Ability to monitor at home

›Ability to return rapidly if worse

Family and household context

›Household exposures

›Sick contacts

›Recent daycare exposure

›Family history relevant to immune risk

›Primary immunodeficiency history

›Hematologic malignancy family history

07Risk Factors/rf23

Host factors and comorbid risks

›Comorbid risks

›Diabetes mellitus (E11.9)

›Chronic kidney disease (N18.9)

›Cirrhosis (K74.60)

›Asplenia (Q89.01)

Exposure risks

›Exposure risks

›Recent travel within 30 days

›High risk food exposures

›Animal exposures

Device and procedure risks

›Portals of entry

›Central line

›Recent surgery within 30 days

›Mucositis

Opportunistic infection risks by immune deficit

›Pattern based risks

›Neutropenia

›Gram negative bacteremia risk

›Invasive aspergillosis risk with prolonged neutropenia

›T cell suppression

›Pneumocystis jirovecii pneumonia risk

›CMV disease risk

›Asplenia

›Encapsulated bacteria

›Fulminant sepsis risk

08Differential Diagnosis/ddx51

Life threatening

›Immediate threats

›Sepsis and septic shock (A41.9) (R65.21)

›Hypotension or lactate elevation

›Organ dysfunction

›Febrile neutropenia with bacteremia (D70.9)

›ANC less than 0.5 x 10^9/L

›Rapid deterioration risk

›Bacterial meningitis (G00.9)

›Headache with neck stiffness

›Altered mental status

›Severe pneumonia

›Hypoxemia

›New infiltrate

›Central line associated bloodstream infection (T80.211A)

›Fever with central access

›No alternative source

›Disseminated zoster or HSV

›Vesicular rash

›Encephalitis signs

Common

›High probability causes

›Community acquired pneumonia (J18.9)

›Cough or dyspnea

›Focal crackles

›Urinary tract infection and pyelonephritis (N39.0) (N10)

›Dysuria

›CVA tenderness

›Skin and soft tissue infection (L03.90)

›Erythema

›Warmth

›Viral syndrome

›Upper respiratory symptoms

›Myalgias

Less common and opportunistic

›Opportunistic infections and mimics

›Pneumocystis jirovecii pneumonia

›Subacute dyspnea

›Hypoxemia out of proportion to CXR

›Invasive aspergillosis

›Prolonged neutropenia

›Pleuritic pain or hemoptysis

›CMV disease

›Transplant or advanced HIV

›Cytopenias or GI symptoms

›Tuberculosis

›Night sweats

›Weight loss

›Endocarditis (I33.0)

›New murmur

›Embolic signs

›Drug fever

›Temporal relation to new medication

›Relative bradycardia pattern possible

09Past Medical History/pmh25

Immunocompromised diagnoses and timelines

›Immune compromising conditions

›Hematologic malignancy

›Disease status

›Most recent therapy date

›Solid tumor on chemotherapy

›Most recent cycle date

›Prior febrile neutropenia episodes

›Solid organ transplant

›Transplant type and date

›Rejection history

›HIV

›Most recent viral load

›Opportunistic infection history

Prior infections and colonization

›Infection history

›Prior bacteremia

›Prior C difficile

›Prior fungal infection

›Prior resistant organisms

Procedures and devices

›Prior procedures

›Central line placement date

›Recent surgery details

›Implanted devices

›Port or PICC

›Prosthetic joints

›Cardiac devices

10Physical Exam/exam35

General and hemodynamics

›Clinical appearance

›Toxic appearance

›Rigors

›Perfusion

›Capillary refill delay

›Mottling

›Vitals pattern

›Fever confirmation

›Tachycardia severity

›Hypotension pattern

Focused infection source exam

›Source directed exam

›Skin and line sites

›Catheter insertion site erythema

›Tenderness along tunneled catheter

›HEENT

›Oral mucositis

›Sinus tenderness

›Lungs

›Focal crackles

›Increased work of breathing

›Abdomen

›Peritoneal signs

›Hepatosplenomegaly

›GU

›CVA tenderness

›Suprapubic tenderness

›Neuro

›Nuchal rigidity

›Focal deficits

Subtle and high risk findings in immunocompromised

›Atypical presentations

›Minimal localizing signs despite severe infection

›Blunted fever response

›Rash patterns

›Petechiae or purpura

›Vesicular lesions

11Lab Studies/labs37

Sepsis and baseline labs

›Core labs

›CBC with differential

›ANC calculation

›Platelets for bleeding risk

›CMP

›Creatinine for dosing

›Liver enzymes for drug toxicity

›Lactate

›2 mmol/L or higher suggests hypoperfusion

›4 mmol/L or higher high risk

›Blood gas if respiratory distress

›pH assessment

›PaCO2 assessment

Microbiology

›Cultures

›Blood cultures before antibiotics if feasible

›Two peripheral sets

›From each central line lumen if present

›Urine culture when urinary symptoms or abnormal urinalysis

›Sputum culture when productive cough

›Stool testing when diarrhea

›C difficile NAAT local protocol dependent

›Enteric pathogen panel local protocol dependent

Targeted tests for immune deficit patterns

›Opportunistic workup

›HIV testing when status unknown

›Ag Ab

›Viral load when known HIV with concern for failure

›Fungal markers

›Serum beta D glucan

›Serum galactomannan

›Viral PCRs

›Influenza

›SARS CoV 2

›CMV PCR in transplant or advanced HIV

Pitfalls and limitations

›Limitations

›Normal WBC does not exclude severe infection

›Afebrile sepsis possible in profound immunosuppression

›Early cultures can be negative despite invasive infection

12Imaging/img39

Scoring Systems

›Risk tools for severity and disposition

›qSOFA for bedside screening

›RR 22 or higher

›SBP 100 mmHg or lower

›Altered mentation

›SOFA for organ dysfunction

›Use with labs and vitals trend

›Rising score supports high risk

›NEWS2 local protocol dependent

›Respiratory rate and oxygen requirement

›Blood pressure and mental status

›MASCC risk index for febrile neutropenia

›Identifies lower risk candidates

›Outpatient pathway local protocol dependent

›CISNE for apparently stable febrile neutropenia

›Identifies risk among solid tumor patients

›Use only in clinically stable patients

MRI

›MRI indications in immunocompromised fever

›Suspected spinal epidural abscess

›Suspected brain abscess or encephalitis with focal deficits

›Suspected osteomyelitis when CT nondiagnostic

›MRI considerations

›Gadolinium contrast risk in severe renal failure

›Device compatibility

›CT indications

›CT chest for hypoxemia with nondiagnostic CXR

›CT abdomen pelvis for neutropenic enterocolitis concern

›CT head for focal deficits or severe headache with immunosuppression

›CT cautions

›IV contrast nephrotoxicity risk

›Contrast allergy history

Ultrasound

›Ultrasound applications

›POCUS IVC and cardiac function in shock

›Lung ultrasound for interstitial syndrome and effusions

›RUQ ultrasound for biliary source

›Renal ultrasound for hydronephrosis

›Ultrasound pitfalls

›Early pneumonia can be missed on CXR and sometimes on ultrasound

›Neutropenic enterocolitis requires CT for evaluation

13Special Tests/spec17

Source control and procedural diagnostics

›Procedural diagnostics

›Lumbar puncture when meningitis encephalitis suspected

›Defer for unstable airway or hemodynamics

›Consider CT head first with focal deficits or severely altered mental status

›Diagnostic paracentesis in cirrhosis with fever

›PMN threshold local protocol dependent

›Culture yield improved with bedside inoculation

›Thoracentesis for moderate to large effusion with infection concern

›pH and glucose interpretation

›Gram stain and culture

Respiratory and fungal evaluation

›Advanced infectious testing

›Bronchoscopy with BAL local protocol dependent

›Pneumocystis testing

›Aspergillus testing

›Cryptococcal antigen in advanced HIV with headache

›Serum testing

›CSF testing if LP performed

14ECG/ecg11

Indications in febrile immunocompromised patient

›ECG triggers

›Chest pain or dyspnea

›Electrolyte abnormalities

›QT prolonging antimicrobials planned

High risk patterns and medication safety

›Patterns impacting management

›QTc prolongation

›Avoid stacking QT prolonging agents when possible

›Correct potassium and magnesium

›New ischemia patterns

›Demand ischemia in sepsis

›Consider ACS pathway if symptoms or dynamic changes

15Assessment/ax24

Problem representation and severity

›Syndrome framing

›Fever in immunocompromised host

›Source identified

›Source not identified

›Sepsis spectrum

›Sepsis without shock

›Septic shock

›Febrile neutropenia status

›Confirmed neutropenia

›Neutropenia pending but high suspicion

Key complications to rule out early

›Complications

›Bacteremia and line infection

›Positive blood cultures

›Persistent fever after antibiotics

›Invasive fungal infection

›Prolonged neutropenia

›Pulmonary symptoms with CT findings

›CNS infection

›Altered mental status

›Headache with neck stiffness

Diagnostic uncertainty tracking

›Alternative explanations

›Drug fever

›Thromboembolism

›Malignancy related fever

16Plan/plan59

Immediate stabilization priorities

›Time critical actions

›Monitoring

›Continuous pulse oximetry for hypoxemia risk

›Cardiac monitoring for instability or QT risk

›IV access

›Two large bore peripheral IVs for shock

›Use existing central access when appropriate

›Fluids for shock

›Crystalloid 30 mL/kg within 3 hours for septic shock local protocol dependent

›Reassess after each bolus for overload

›Vasopressors if fluid refractory shock

›Norepinephrine infusion local protocol dependent

›MAP target 65 mmHg

Antibiotics timing and selection

›Antibiotic timing targets

›Suspected sepsis

›Antibiotics within 1 hour

›Cultures before antibiotics if no delay

›Febrile neutropenia

›Antipseudomonal beta lactam within 60 minutes

›Do not delay for imaging

›Empiric regimens local protocol dependent

›Hemodynamically stable febrile neutropenia

›Cefepime IV 2 g every 8 hours

›Piperacillin tazobactam IV 4.5 g every 6 hours

›Severe sepsis or septic shock in neutropenia

›Add vancomycin IV 15 to 20 mg/kg per dose

›Consider aminoglycoside single dose local protocol dependent

›MRSA coverage indications

›Pneumonia

›Skin and soft tissue infection

›Suspected catheter infection

›ESBL or resistant gram negative risk

›Meropenem IV 1 g every 8 hours

›Local antibiogram dependent

Antifungal and antiviral escalation

›Antifungal escalation local protocol dependent

›Persistent fever after 4 to 7 days of broad spectrum antibiotics with neutropenia

›Echinocandin example micafungin IV 100 mg daily

›Voriconazole for suspected aspergillosis local protocol dependent

›Suspected mucormycosis

›Liposomal amphotericin B local protocol dependent

›Urgent ENT or surgery for source control

›Antiviral considerations

›Influenza suspected

›Oseltamivir dosing local protocol dependent

›Start without waiting for PCR if high suspicion

›Suspected HSV or VZV CNS infection

›Acyclovir IV 10 mg/kg every 8 hours

›Renal adjustment required

Source control and consultation

›Source control priorities

›Drain abscess when identified

›Remove infected catheter when indicated

›Consultations

›Infectious diseases for complex immunocompromised fever

›Oncology or transplant team for regimen alignment

›ICU for shock or escalating oxygen needs

Reassessment loop

›Reassessment cadence

›Repeat vitals every 15 to 30 minutes if unstable

›Repeat lactate within 2 to 4 hours if elevated

›Repeat focused exam after antibiotics and fluids

17Disposition/dispo18

ICU criteria

›ICU indications

›Vasopressor requirement

›Mechanical ventilation or high flow oxygen requirement

›Persistent lactate 4 mmol/L or higher despite resuscitation

›Rapidly progressive organ dysfunction

Inpatient admission criteria

›Admission indications

›Febrile neutropenia with any instability

›New hypoxemia or pneumonia

›Suspected CNS infection

›Inability to tolerate oral intake

›Unreliable follow up or poor home supports

Observation or outpatient pathway local protocol dependent

›Lower risk candidates

›Clinically stable after ED treatment

›No organ dysfunction

›Low risk febrile neutropenia by MASCC or CISNE when applicable

Transfer criteria

›Higher level care needs

›No local ICU capability

›Need for urgent specialty services

18Discharge Instructions/di20

Copy discharge instructions

›Diagnosis summary

›Fever in an immunocompromised state can become serious quickly even when symptoms are mild

›Your tests today did not show a clear source that needs admission right now based on current findings

›Medications

›Take prescribed antibiotics exactly as directed if provided

›Do not start leftover antibiotics without medical advice

›Hydration and activity

›Drink fluids as tolerated

›Avoid strenuous activity until fever resolves

›Follow up timing

›Contact your oncology transplant specialist or primary clinician within 24 hours

›Review pending culture results as directed

›Return immediately for

›Trouble breathing

›New confusion

›Chest pain

›Severe headache or neck stiffness

›Fainting or severe weakness

›Persistent vomiting or inability to keep fluids down

›Fever returning or worsening within 24 to 48 hours

19References/r7

Guidelines and key references

›Core guidance

›IDSA clinical practice guideline for fever and neutropenia 2010

›NCCN guidelines for prevention and treatment of cancer related infections current version local protocol dependent

›Surviving Sepsis Campaign guidelines 2021

›IDSA guideline for management of candidiasis 2016 update

›IDSA guideline for aspergillosis 2016

›Project source file

Evidence & Review

Reviewed by SymptomDx Medical Team · Last reviewed February 24, 2026

SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.

Fever In The Immunocompromised PatientAPPROACH

INFECTIOUS DISEASE AND FEVER SYNDROMES · 19 SECTIONS

⚲

589 items

☷ Legend

⚲

Resuscitation and Universal Approaches9▾

Chest and Cardiovascular12▾

Respiratory11▾

Abdominal and Gastrointestinal24▾

Renal and Urinary7▾

Neurologic11▾

Back and Neck8▾

Women's Health, Pregnancy, and GU11▾

Infectious Disease and Fever Syndromes11▾

Allergy and Dermatology7▾

Musculoskeletal and Extremities14▾

Trauma and Wounds14▾

ENT, Eye, Dental10▾

Endocrine, Metabolic, and Abnormal Labs9▾

Toxicology and Behavioral14▾

Pediatrics16▾

Environmental and Exposure4▾

01History/hx79

Immunocompromised context

›Host defense status

›Neutropenia

›ANC less than 0.5 x 10^9/L

›Expected ANC less than 0.5 x 10^9/L within 48 hours

›Cellular immunodeficiency

›Solid organ transplant

›Hematopoietic stem cell transplant

›Humoral or splenic dysfunction

›Asplenia or functional asplenia

›Hypogammaglobulinemia

›HIV status

›Known CD4 nadir and most recent CD4

›ART use and adherence

›Immunosuppressive therapies

›Systemic corticosteroids

›Biologics

›Chemotherapy

›Other immune risk states

›Cirrhosis

›Chronic kidney disease

Fever details and timeline

›Symptom chronology

›Time of first fever or chills

›Course

›Persistent

›Intermittent

›Recurrent

›Highest measured temperature and measurement method

Infection focus and symptom clusters

›Localizing symptoms

›Respiratory

›Cough

›Dyspnea

›Pleuritic pain

›Gastrointestinal

›Abdominal pain

›Diarrhea

›Odynophagia

›Genitourinary

›Dysuria

›Flank pain

›Pelvic pain

›Skin and soft tissue

›Rash

›Pain at catheter site

›Neurologic

›Headache

›Confusion

›Neck stiffness

Exposures and context

›Exposure history

›Sick contacts

›Travel

›Within 30 days

›Endemic exposures

›Animal exposures

›Cat scratches

›Bird or bat exposure

›Food and water exposures

›Undercooked foods

›Unpasteurized dairy

›Environmental exposures

›Mold or construction

›Freshwater exposure

Prior care and antimicrobials

›Recent healthcare encounters

›Recent hospitalization within 90 days

›Recent ICU stay

›Recent antibiotic exposure within 90 days

›Prior cultures and resistant organisms

›MRSA colonization or infection

›ESBL history

›Carbapenem resistant organisms history

Devices and portals of entry

›Indwelling devices

›Central venous catheter

›PICC

›Port

›Urinary catheter

›Ventricular shunt

›Recent procedures

›Dental

›Endoscopy

›Biopsy

02Alarm Features/alarm49

First 5 minutes and escalation triggers

›Immediate escalation criteria

›Hypotension

›SBP less than 90 mmHg

›MAP less than 65 mmHg

›Hypoxemia

›SpO2 less than 92 percent on room air

›Escalating oxygen requirement

›Altered mental status

›New confusion

›GCS less than 13

›Respiratory distress

›RR 30 or higher

›Use of accessory muscles

›Shock physiology

›Lactate 4 mmol/L or higher

›Cool mottled extremities

High risk immunocompromised syndromes

›Cannot miss syndromes

›Febrile neutropenia

›Fever with ANC less than 0.5 x 10^9/L

›Treat as sepsis until proven otherwise

›Central line associated bloodstream infection

›Fever with indwelling central access

›Local catheter pain or erythema

›Meningitis or encephalitis

›Headache with fever

›Neck stiffness

›New focal neurologic deficit

›Pneumonia with hypoxemia

›SpO2 less than 92 percent

›New infiltrate or respiratory symptoms

›Necrotizing soft tissue infection

›Pain out of proportion

›Rapid progression

Dangerous vital sign patterns

›High risk vitals

›HR 130 or higher

›RR 30 or higher

›Temp 39.5 C or higher

›SBP less than 90 mmHg

›SpO2 less than 92 percent

Immediate consult activation triggers

›Early specialty involvement triggers

›Hemodynamic instability

›ICU

›Critical care

›Febrile neutropenia with instability

›Oncology

›Infectious diseases

›Suspected invasive fungal infection

›Infectious diseases

›Hematology oncology

03Medications/meds39

Immunosuppressants and infection risk medications

›Immunosuppression profile

›Systemic corticosteroids

›Prednisone equivalent 20 mg daily or higher for 14 days or longer

›Recent pulse dosing

›Calcineurin inhibitors

›Tacrolimus

›Cyclosporine

›Antimetabolites

›Mycophenolate

›Azathioprine

›Biologics

›Anti TNF agents

›Anti CD20 agents

›Chemotherapy agents

›Last cycle date

›Nadir timing estimate

Antimicrobial prophylaxis and adherence

›Prophylaxis

›TMP SMX prophylaxis

›Pneumocystis prevention

›Missed doses

›Antiviral prophylaxis

›Acyclovir or valacyclovir

›CMV prophylaxis

›Antifungal prophylaxis

›Fluconazole

›Posaconazole or voriconazole

Medication interactions and contraindications

›Interaction traps

›QT prolonging combinations

›Fluoroquinolones

›Azoles

›Nephrotoxicity combinations

›Vancomycin plus piperacillin tazobactam

›Aminoglycosides

›Serotonergic agents with linezolid

›SSRIs

›SNRIs

›Allergy history

›Beta lactam reactions

›Prior anaphylaxis history

04Diet/diet15

Hydration and intake

›Intake pattern

›Poor oral intake

›Vomiting limiting intake

›Diarrhea limiting intake

›Hydration indicators

›Reduced urine output

›Orthostasis symptoms

Food and water exposures

›High risk exposures

›Unpasteurized dairy

›Undercooked meats

›Raw seafood

›Well water

Substance exposures relevant to fever mimics

›Exposures

›Alcohol withdrawal risk

›Stimulant use

05Review of Systems/ros28

Constitutional and infection symptoms

›Systemic symptoms

›Chills and rigors

›Night sweats

›Weight loss

›Fatigue

Cardiopulmonary

›Cardiopulmonary symptoms

›Chest pain

›Dyspnea

›Cough

›Hemoptysis

Gastrointestinal and hepatobiliary

›GI symptoms

›Abdominal pain

›Diarrhea

›Nausea

›Jaundice

Genitourinary

›GU symptoms

›Dysuria

›Frequency

›Flank pain

Neurologic and ENT

›Neuro ENT symptoms

›Headache

›Photophobia

›Neck stiffness

›Confusion

Skin and musculoskeletal

›Skin MSK symptoms

›Rash

›Joint pain

›Focal limb pain

06Collateral History and Family History/chafh13

Collateral reliability and supports

›Collateral sources

›Caregiver report

›Pharmacy reconciliation

›Oncology transplant clinic documentation

›Support reliability

›Ability to monitor at home

›Ability to return rapidly if worse

Family and household context

›Household exposures

›Sick contacts

›Recent daycare exposure

›Family history relevant to immune risk

›Primary immunodeficiency history

›Hematologic malignancy family history

07Risk Factors/rf23

Host factors and comorbid risks

›Comorbid risks

›Diabetes mellitus (E11.9)

›Chronic kidney disease (N18.9)

›Cirrhosis (K74.60)

›Asplenia (Q89.01)

Exposure risks

›Exposure risks

›Recent travel within 30 days

›High risk food exposures

›Animal exposures

Device and procedure risks

›Portals of entry

›Central line

›Recent surgery within 30 days

›Mucositis

Opportunistic infection risks by immune deficit

›Pattern based risks

›Neutropenia

›Gram negative bacteremia risk

›Invasive aspergillosis risk with prolonged neutropenia

›T cell suppression

›Pneumocystis jirovecii pneumonia risk

›CMV disease risk

›Asplenia

›Encapsulated bacteria

›Fulminant sepsis risk

08Differential Diagnosis/ddx51

Life threatening

›Immediate threats

›Sepsis and septic shock (A41.9) (R65.21)

›Hypotension or lactate elevation

›Organ dysfunction

›Febrile neutropenia with bacteremia (D70.9)

›ANC less than 0.5 x 10^9/L

›Rapid deterioration risk

›Bacterial meningitis (G00.9)

›Headache with neck stiffness

›Altered mental status

›Severe pneumonia

›Hypoxemia

›New infiltrate

›Central line associated bloodstream infection (T80.211A)

›Fever with central access

›No alternative source

›Disseminated zoster or HSV

›Vesicular rash

›Encephalitis signs

Common

›High probability causes

›Community acquired pneumonia (J18.9)

›Cough or dyspnea

›Focal crackles

›Urinary tract infection and pyelonephritis (N39.0) (N10)

›Dysuria

›CVA tenderness

›Skin and soft tissue infection (L03.90)

›Erythema

›Warmth

›Viral syndrome

›Upper respiratory symptoms

›Myalgias

Less common and opportunistic

›Opportunistic infections and mimics

›Pneumocystis jirovecii pneumonia

›Subacute dyspnea

›Hypoxemia out of proportion to CXR

›Invasive aspergillosis

›Prolonged neutropenia

›Pleuritic pain or hemoptysis

›CMV disease

›Transplant or advanced HIV

›Cytopenias or GI symptoms

›Tuberculosis

›Night sweats

›Weight loss

›Endocarditis (I33.0)

›New murmur

›Embolic signs

›Drug fever

›Temporal relation to new medication

›Relative bradycardia pattern possible

09Past Medical History/pmh25

Immunocompromised diagnoses and timelines

›Immune compromising conditions

›Hematologic malignancy

›Disease status

›Most recent therapy date

›Solid tumor on chemotherapy

›Most recent cycle date

›Prior febrile neutropenia episodes

›Solid organ transplant

›Transplant type and date

›Rejection history

›HIV

›Most recent viral load

›Opportunistic infection history

Prior infections and colonization

›Infection history

›Prior bacteremia

›Prior C difficile

›Prior fungal infection

›Prior resistant organisms

Procedures and devices

›Prior procedures

›Central line placement date

›Recent surgery details

›Implanted devices

›Port or PICC

›Prosthetic joints

›Cardiac devices

10Physical Exam/exam35

General and hemodynamics

›Clinical appearance

›Toxic appearance

›Rigors

›Perfusion

›Capillary refill delay

›Mottling

›Vitals pattern

›Fever confirmation

›Tachycardia severity

›Hypotension pattern

Focused infection source exam

›Source directed exam

›Skin and line sites

›Catheter insertion site erythema

›Tenderness along tunneled catheter

›HEENT

›Oral mucositis

›Sinus tenderness

›Lungs

›Focal crackles

›Increased work of breathing

›Abdomen

›Peritoneal signs

›Hepatosplenomegaly

›GU

›CVA tenderness

›Suprapubic tenderness

›Neuro

›Nuchal rigidity

›Focal deficits

Subtle and high risk findings in immunocompromised

›Atypical presentations

›Minimal localizing signs despite severe infection

›Blunted fever response

›Rash patterns

›Petechiae or purpura

›Vesicular lesions

11Lab Studies/labs37

Sepsis and baseline labs

›Core labs

›CBC with differential

›ANC calculation

›Platelets for bleeding risk

›CMP

›Creatinine for dosing

›Liver enzymes for drug toxicity

›Lactate

›2 mmol/L or higher suggests hypoperfusion

›4 mmol/L or higher high risk

›Blood gas if respiratory distress

›pH assessment

›PaCO2 assessment

Microbiology

›Cultures

›Blood cultures before antibiotics if feasible

›Two peripheral sets

›From each central line lumen if present

›Urine culture when urinary symptoms or abnormal urinalysis

›Sputum culture when productive cough

›Stool testing when diarrhea

›C difficile NAAT local protocol dependent

›Enteric pathogen panel local protocol dependent

Targeted tests for immune deficit patterns

›Opportunistic workup

›HIV testing when status unknown

›Ag Ab

›Viral load when known HIV with concern for failure

›Fungal markers

›Serum beta D glucan

›Serum galactomannan

›Viral PCRs

›Influenza

›SARS CoV 2

›CMV PCR in transplant or advanced HIV

Pitfalls and limitations

›Limitations

›Normal WBC does not exclude severe infection

›Afebrile sepsis possible in profound immunosuppression

›Early cultures can be negative despite invasive infection

12Imaging/img39

Scoring Systems

›Risk tools for severity and disposition

›qSOFA for bedside screening

›RR 22 or higher

›SBP 100 mmHg or lower

›Altered mentation

›SOFA for organ dysfunction

›Use with labs and vitals trend

›Rising score supports high risk

›NEWS2 local protocol dependent

›Respiratory rate and oxygen requirement

›Blood pressure and mental status

›MASCC risk index for febrile neutropenia

›Identifies lower risk candidates

›Outpatient pathway local protocol dependent

›CISNE for apparently stable febrile neutropenia

›Identifies risk among solid tumor patients

›Use only in clinically stable patients

MRI

›MRI indications in immunocompromised fever

›Suspected spinal epidural abscess

›Suspected brain abscess or encephalitis with focal deficits

›Suspected osteomyelitis when CT nondiagnostic

›MRI considerations

›Gadolinium contrast risk in severe renal failure

›Device compatibility

›CT indications

›CT chest for hypoxemia with nondiagnostic CXR

›CT abdomen pelvis for neutropenic enterocolitis concern

›CT head for focal deficits or severe headache with immunosuppression

›CT cautions

›IV contrast nephrotoxicity risk

›Contrast allergy history

Ultrasound

›Ultrasound applications

›POCUS IVC and cardiac function in shock

›Lung ultrasound for interstitial syndrome and effusions

›RUQ ultrasound for biliary source

›Renal ultrasound for hydronephrosis

›Ultrasound pitfalls

›Early pneumonia can be missed on CXR and sometimes on ultrasound

›Neutropenic enterocolitis requires CT for evaluation

13Special Tests/spec17

Source control and procedural diagnostics

›Procedural diagnostics

›Lumbar puncture when meningitis encephalitis suspected

›Defer for unstable airway or hemodynamics

›Consider CT head first with focal deficits or severely altered mental status

›Diagnostic paracentesis in cirrhosis with fever

›PMN threshold local protocol dependent

›Culture yield improved with bedside inoculation

›Thoracentesis for moderate to large effusion with infection concern

›pH and glucose interpretation

›Gram stain and culture

Respiratory and fungal evaluation

›Advanced infectious testing

›Bronchoscopy with BAL local protocol dependent

›Pneumocystis testing

›Aspergillus testing

›Cryptococcal antigen in advanced HIV with headache

›Serum testing

›CSF testing if LP performed

14ECG/ecg11

Indications in febrile immunocompromised patient

›ECG triggers

›Chest pain or dyspnea

›Electrolyte abnormalities

›QT prolonging antimicrobials planned

High risk patterns and medication safety

›Patterns impacting management

›QTc prolongation

›Avoid stacking QT prolonging agents when possible

›Correct potassium and magnesium

›New ischemia patterns

›Demand ischemia in sepsis

›Consider ACS pathway if symptoms or dynamic changes

15Assessment/ax24

Problem representation and severity

›Syndrome framing

›Fever in immunocompromised host

›Source identified

›Source not identified

›Sepsis spectrum

›Sepsis without shock

›Septic shock

›Febrile neutropenia status

›Confirmed neutropenia

›Neutropenia pending but high suspicion

Key complications to rule out early

›Complications

›Bacteremia and line infection

›Positive blood cultures

›Persistent fever after antibiotics

›Invasive fungal infection

›Prolonged neutropenia

›Pulmonary symptoms with CT findings

›CNS infection

›Altered mental status

›Headache with neck stiffness

Diagnostic uncertainty tracking

›Alternative explanations

›Drug fever

›Thromboembolism

›Malignancy related fever

16Plan/plan59

Immediate stabilization priorities

›Time critical actions

›Monitoring

›Continuous pulse oximetry for hypoxemia risk

›Cardiac monitoring for instability or QT risk

›IV access

›Two large bore peripheral IVs for shock

›Use existing central access when appropriate

›Fluids for shock

›Crystalloid 30 mL/kg within 3 hours for septic shock local protocol dependent

›Reassess after each bolus for overload

›Vasopressors if fluid refractory shock

›Norepinephrine infusion local protocol dependent

›MAP target 65 mmHg

Antibiotics timing and selection

›Antibiotic timing targets

›Suspected sepsis

›Antibiotics within 1 hour

›Cultures before antibiotics if no delay

›Febrile neutropenia

›Antipseudomonal beta lactam within 60 minutes

›Do not delay for imaging

›Empiric regimens local protocol dependent

›Hemodynamically stable febrile neutropenia

›Cefepime IV 2 g every 8 hours

›Piperacillin tazobactam IV 4.5 g every 6 hours

›Severe sepsis or septic shock in neutropenia

›Add vancomycin IV 15 to 20 mg/kg per dose

›Consider aminoglycoside single dose local protocol dependent

›MRSA coverage indications

›Pneumonia

›Skin and soft tissue infection

›Suspected catheter infection

›ESBL or resistant gram negative risk

›Meropenem IV 1 g every 8 hours

›Local antibiogram dependent

Antifungal and antiviral escalation

›Antifungal escalation local protocol dependent

›Persistent fever after 4 to 7 days of broad spectrum antibiotics with neutropenia

›Echinocandin example micafungin IV 100 mg daily

›Voriconazole for suspected aspergillosis local protocol dependent

›Suspected mucormycosis

›Liposomal amphotericin B local protocol dependent

›Urgent ENT or surgery for source control

›Antiviral considerations

›Influenza suspected

›Oseltamivir dosing local protocol dependent

›Start without waiting for PCR if high suspicion

›Suspected HSV or VZV CNS infection

›Acyclovir IV 10 mg/kg every 8 hours

›Renal adjustment required

Source control and consultation

›Source control priorities

›Drain abscess when identified

›Remove infected catheter when indicated

›Consultations

›Infectious diseases for complex immunocompromised fever

›Oncology or transplant team for regimen alignment

›ICU for shock or escalating oxygen needs

Reassessment loop

›Reassessment cadence

›Repeat vitals every 15 to 30 minutes if unstable

›Repeat lactate within 2 to 4 hours if elevated

›Repeat focused exam after antibiotics and fluids

17Disposition/dispo18

ICU criteria

›ICU indications

›Vasopressor requirement

›Mechanical ventilation or high flow oxygen requirement

›Persistent lactate 4 mmol/L or higher despite resuscitation

›Rapidly progressive organ dysfunction

Inpatient admission criteria

›Admission indications

›Febrile neutropenia with any instability

›New hypoxemia or pneumonia

›Suspected CNS infection

›Inability to tolerate oral intake

›Unreliable follow up or poor home supports

Observation or outpatient pathway local protocol dependent

›Lower risk candidates

›Clinically stable after ED treatment

›No organ dysfunction

›Low risk febrile neutropenia by MASCC or CISNE when applicable

Transfer criteria

›Higher level care needs

›No local ICU capability

›Need for urgent specialty services

18Discharge Instructions/di20

Copy discharge instructions

›Diagnosis summary

›Fever in an immunocompromised state can become serious quickly even when symptoms are mild

›Your tests today did not show a clear source that needs admission right now based on current findings

›Medications

›Take prescribed antibiotics exactly as directed if provided

›Do not start leftover antibiotics without medical advice

›Hydration and activity

›Drink fluids as tolerated

›Avoid strenuous activity until fever resolves

›Follow up timing

›Contact your oncology transplant specialist or primary clinician within 24 hours

›Review pending culture results as directed

›Return immediately for

›Trouble breathing

›New confusion

›Chest pain

›Severe headache or neck stiffness

›Fainting or severe weakness

›Persistent vomiting or inability to keep fluids down

›Fever returning or worsening within 24 to 48 hours

19References/r7

Guidelines and key references

›Core guidance

›IDSA clinical practice guideline for fever and neutropenia 2010

›NCCN guidelines for prevention and treatment of cancer related infections current version local protocol dependent

›Surviving Sepsis Campaign guidelines 2021

›IDSA guideline for management of candidiasis 2016 update

›IDSA guideline for aspergillosis 2016

›Project source file

Evidence & Review

Reviewed by SymptomDx Medical Team · Last reviewed February 24, 2026

SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.