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Pelvic Inflammatory Disease (PID)
Cardiovascular Presentations
Abdominal aortic aneurysm
Acute coronary syndrome (NSTEMI)
Acute coronary syndrome (STEMI)
Acute decompensated heart failure
Acute limb ischemia
Acute mesenteric ischemia
Aortic dissection
Aortic stenosis
Atrial fibrillation and flutter
Bradyarrhythmia and heart block
Cardiac arrest
Deep vein thrombosis
Myocarditis
Pericarditis
Pulmonary embolism
Stable angina
Superficial thrombophlebitis
Superior vena cava syndrome
Supraventricular tachycardia
Syncope (cardiogenic)
Unstable angina
Ventricular tachycardia
Respiratory Presentations
Acute bronchitis
Acute respiratory failure
Aspiration pneumonia
Asthma exacerbation
Bronchiolitis
Community-acquired pneumonia
COVID-19 pneumonia
COPD exacerbation
Croup
Croup (laryngotracheobronchitis)
Epiglottitis
Hemothorax
Hospital-acquired pneumonia
Pleural effusion
Pneumothorax (traumatic)
Pulmonary contusion
Spontaneous pneumothorax
Neurological Presentations
Bell's palsy
Benign paroxysmal positional vertigo
Brain abscess
Cauda equina syndrome
Cervical radiculopathy
Concussion (mild traumatic brain injury)
Encephalitis
Guillain-Barré syndrome
Hemorrhagic stroke (intracerebral)
Ischemic stroke
Lumbar radiculopathy
Malignant spinal cord compression
Migraine
Peripheral neuropathy (acute)
Retropharyngeal abscess
Schizophrenia (acute exacerbation)
Seizure (breakthrough:known epilepsy)
Seizure (first-time)
Spinal cord injury
Status epilepticus
Subarachnoid hemorrhage
Tension headache
Transient ischemic attack
Traumatic brain injury (moderate-severe)
Vestibular neuritis
Viral meningitis
Gastrointestinal Presentations
Acute appendicitis
Acute cholecystitis
Acute diverticulitis
Acute pancreatitis
Anal fissure
Choledocholithiasis and cholangitis
Clostridioides difficile colitis
Gastritis
Gastroenteritis (viral and bacterial)
Gastroesophageal reflux disease
Incarcerated or strangulated hernia
Inflammatory bowel disease flare
Large bowel obstruction
Lower GI hemorrhage
Peptic ulcer disease
Perforated viscus
Small bowel obstruction
Upper GI hemorrhage
Genitourinary and Reproductive Presentations
Acute prostatitis
Acute urinary retention
Ectopic pregnancy
Epididymitis
Orchitis
Ovarian torsion
Paraphimosis
Pelvic inflammatory disease
Priapism
Pyelonephritis
Renal laceration
Ruptured ovarian cyst
Testicular torsion
Tubo-ovarian abscess
Urinary tract infection (uncomplicated)
Urolithiasis (renal colic)
Vaginal bleeding (non-pregnant)
Infectious Disease Presentations
Acute sinusitis
Acute tonsillitis
Acute upper respiratory infection
Animal bite
Bacterial meningitis
Cellulitis
Conjunctivitis (bacterial)
Dental abscess
Endocarditis
Febrile neutropenia
Fournier gangrene
Hand-foot-mouth disease
Hepatitis (acute)
Herpes zoster
HIV-related illness
Human bite
Impetigo
Infected diabetic foot ulcer
Infectious mononucleosis
Influenza
Necrotizing fasciitis
Osteomyelitis
Otitis externa
Parasitic infection
Periorbital cellulitis
Peritonsillar abscess
Scabies
Sepsis
Septic arthritis
Spontaneous bacterial peritonitis
Tick-borne illness (Lyme disease)
Tinea infection
Tuberculosis
Viral exanthem
Wound infection
Trauma Presentations
Achilles tendon rupture
ACL and mceniscus tear
Ankle fracture
Ankle sprain
Burn
Calcaneus fracture
Cervical spine fracture
Clavicle fracture
Dental avulsion
Distal radius fracture
Drowning
Elbow fracture and dislocation
Electrical injury
Facial bone fracture
Facial laceration
Femur fracture
Fingertip amputation
Forearm fracture (radius and ulna)
Frostbite
Hand:finger laceration
Heat exhaustion
Heat stroke
Hip fracture
Humeral shaft fracture
Knee dislocation
Knee sprain
Lightning injury
Mandible fracture
Metacarpal fracture
Metatarsal fracture
Muscle strain
Nasal fracture
Non-accidental trauma
Orbital fracture
Patella fracture
Phalanx fracture (finger)
Proximal humerus fracture
Pulmonary contusion
Rib fracture
Rotator cuff tear (acute traumatic)
Scalp laceration
Scaphoid fracture
Shoulder dislocation
Skull fracture
Splenic laceration
Sternal fracture
Supracondylar pediatric fracture
Tendon laceration (hand:wrist)
Thoracic and lumbar spine fracture
Tibia:fibula fracture
Tibial plateau fracture
Toe fracture
Traumatic epistaxis
Traumatic hyphema
Toxicologic Presentations
Acetaminophen toxicity
Alcohol intoxication
Alcohol withdrawal
Anticholinergic toxicity
Anticoagulant overdose
Benzodiazepine overdose
Benzodiazepine:sedative overdose
Beta-blocker and calcium channel blocker toxicity
Carbon monoxide poisoning
Caustic ingestion
Digoxin toxicity
Drug eruption
Foreign body ingestion
Opioid intoxication
Opioid overdose
Opioid withdrawal
Organophosphate
Salicylate toxicity
Serotonin syndrome
Stimulant intoxication (cocaine, methamphetamine)
Tricyclic antidepressant overdose
Psychiatric Presentations
Acute anxiety
Acute psychosis
Agitation:behavioral emergency
Bipolar disorder
Conversion disorder
Major depressive episode
Neuroleptic malignant syndrome
Suicidal ideation and attempt
Musculoskeletal and Rheumatologic Presentations
Acute low back pain (mechanical)
Bursitis
Cervical radiculopathy
Costochondritis
Gout (acute)
Lumbar radiculopathy
Pseudogout
Tendinitis
Dermatology Presentations
Acute eczema (Eczema acute flare)
Allergic contact dermatitis
Erythema multiforme
Henoch-Schönlein purpura
Pressure injury
Psoriasis (acute flare)
Stevens-Johnson syndrome
Toxic epidermal necrolysis
Urticaria (acute)
Environmental and Exposure Presentations
Envenomation (snake, spider, insect)
High-altitude illness
Hypothermia
Hematologic and Oncologic Presentations
Acute chest syndrome
Coagulopathy
Hyperviscosity syndrome
Sickle cell crisis (vaso-occlusive)
Symptomatic anemia
Thrombocytopenia (severe)
Tumor lysis syndrome
Pediatric-Specific Presentations
Bronchiolitis
Croup
Emergency delivery
Febrile seizure
Kawasaki disease
Neonatal jaundice
Neonatal sepsis
Nursemaid's elbow
Pediatric fever 0 to 28 days
Pediatric fever 29 to 60 days
Pediatric fever 61 to 90 days
Pyloric stenosis
Slipped capital femoral epiphysis
Intussusception
Endocrine and Metabolic Presentations
Adrenal crisis
Diabetic ketoacidosis
Hypercalcemia
Hyperosmolar hyperglycemic state
Hypertensive emergency
Hypertensive urgency
Hypoglycemia
Myasthenia gravis crisis
Myxedema coma
Severe hyperkalemia
Severe hyponatremia
Thyroid storm
ENT and Maxillofacial Presentations
Acute laryngitis
Acute otitis media
Acute pharyngitis
Cerumen impaction
Epistaxis (anterior)
Nasal foreign body
Otitis externa
Tympanic membrane perforation
Ophthalmologic Presentations
Acute angle-closure glaucoma
Central retinal artery occlusion
Chemical eye injury
Corneal abrasion
Corneal ulcer
Globe rupture
Ocular foreign body
Orbital cellulitis
Retinal detachment
Obstetric Presentations
Hyperemesis gravidarum
Painful vaginal bleeding in pregnancy
Placenta previa
Placental abruption
Preeclampsia:eclampsia
Preterm labor
Threatened:inevitable:incomplete abortion
Systemic and Miscellaneous Presentations
Anaphylaxis
Angioedema
Cannabis-induced hyperemesis
Pelvic Inflammatory Disease (PID)
POCUS
Procedures
Calculators
Resuscitation
ECG Guide
Back
Clinical Assessment Checklist
Browse categories and answer follow-up questions to refine your symptom profile.
Approach to the Critical Patient
Immediate priorities
Sepsis recognition
▶
Suspected pelvic source with systemic signs
▶
Temperature >38.3°C or <36°C
Heart rate >90 per minute
Systolic BP <90 mmHg or MAP <65 mmHg
Lactate >=2 mmol/l as organ hypoperfusion marker
If septic shock, broad-spectrum antibiotics within 1 hour
▶
Class I recommendation
Source control evaluation — surgical abdomen exclusion
Life threat exclusion
▶
Ectopic pregnancy ruled out first in all reproductive-age women
▶
Urine beta-hCG mandatory
Positive beta-hCG changes management immediately
Ruptured tubo-ovarian abscess (TOA)
▶
Peritoneal signs: guarding and rebound
Hemodynamic instability with pelvic pain
Surgical abdomen requiring emergent OB/GYN consultation
▶
Appendicitis not excluded
Ovarian torsion with absent flow on Doppler
Key decision branch
▶
Mild to moderate PID pattern
▶
Afebrile or low-grade fever
Tolerating oral intake
No peritoneal signs, no mass
Severe PID pattern
▶
High fever, vomiting, peritoneal signs, or TOA
Requires inpatient IV antibiotics
If surgical emergency cannot be excluded, prioritize imaging and OB/GYN consult
Monitoring and targets
Monitoring bundle
▶
Vital signs every 1 to 2 hours in moderate to severe cases
▶
Temperature trend
Heart rate and blood pressure
Urine output target >=0.5 ml/kg/hour in sepsis
▶
Foley catheter insertion if hemodynamically unstable
Pain reassessment after analgesics
▶
NSAID or opioid as indicated
Worsening pain suggests complication
Escalation triggers
▶
No improvement within 72 hours of antibiotics
▶
Admission if initially outpatient
Imaging for TOA if not yet performed
Worsening hemodynamics
▶
ICU-level care
Vasopressor initiation as needed
Peritoneal signs developing
▶
Emergent OB/GYN surgical consultation
Immediate consults
Consultation triggers
▶
OB/GYN — mandatory in the following scenarios
▶
TOA confirmed or suspected
Surgical abdomen or ruptured TOA
Failed outpatient therapy at 72 hours
Infectious disease
▶
Cephalosporin allergy requiring alternative regimen
Suspected quinolone-resistant gonorrhea
Interventional radiology
▶
TOA failing antibiotic therapy requiring percutaneous drainage
History
Presenting symptoms
Core pelvic pain syndrome
▶
Lower abdominal or pelvic pain
▶
Most common presenting complaint
Typically bilateral or diffuse
Onset timing
▶
Abrupt onset during or shortly after menses is classic
Atypical milder presentations increasingly common
Associated genital symptoms
▶
Abnormal vaginal discharge (mucopurulent)
Intermenstrual or postcoital bleeding
Dyspareunia
Dysuria
Systemic and alarm symptoms
▶
Fever or rigors
▶
Temperature >38.3°C suggests moderate to severe PID
Nausea and vomiting
▶
Suggests severe disease, impairs oral therapy
Right upper quadrant pain
▶
Fitz-Hugh–Curtis perihepatitis
Right shoulder pain possible with diaphragmatic irritation
Joint pain or skin lesions
▶
Disseminated gonococcal infection consideration
Risk factors
Demographic and behavioral risk factors
▶
Age 15 to 25 years — highest incidence group
▶
Peak age group for chlamydial and gonococcal infections
Multiple or new sexual partners
▶
New partner within prior 60 to 90 days is high-yield history
Prior history of STI or PID
▶
Each PID episode increases infertility risk cumulatively
Unprotected sexual intercourse
Procedural and device risk factors
▶
IUD insertion within prior 3 to 6 weeks
▶
Risk returns to baseline after that window
Recent uterine instrumentation
▶
Dilation and curettage
Hysteroscopy, endometrial biopsy
Vaginal douching
▶
Disrupts normal flora
Host factors
▶
Bacterial vaginosis (strongly associated)
HIV or immunosuppression
▶
Increased risk of TOA and atypical pathogens
Smoking
Lower socioeconomic status and limited healthcare access
Key historical elements
Gynecologic history
▶
Last menstrual period
▶
Missed period raises ectopic pregnancy concern
Contraceptive method
▶
IUD timing as noted above
Oral contraceptives may attenuate symptoms
Prior PID episodes — infertility risk cumulates
▶
Approximately 8% after first episode
Approximately 20% after second episode
Approximately 40% after third episode
Sexual and partner history
▶
Number of partners and timing of new partner
Partner symptoms — urethral discharge or dysuria
Partner treatment status and access
History of sexual assault or coercion
Medication and allergy history
▶
Cephalosporin allergy — impacts antibiotic selection
Recent antibiotic use — may modify flora or culture results
Current medications — drug interactions with doxycycline or metronidazole
Physical Exam
Vital signs and general appearance
Stability snapshot
▶
Temperature
▶
>38.3°C as minimum criterion for moderate to severe PID
Hypothermia as severe sepsis marker
Heart rate
▶
Tachycardia suggests sepsis or pain response
Blood pressure
▶
SBP <90 mmHg requires immediate resuscitation
Oxygen saturation
▶
Hypoxia uncommon in uncomplicated PID — raises sepsis concern
General appearance
▶
Degree of distress
▶
Writhing vs guarded vs toxic appearance
Peritoneal posturing
▶
Lying still vs difficulty with movement
Abdominal exam
Abdominal tenderness pattern
▶
Lower abdominal tenderness
▶
Typically bilateral or diffuse in PID
Unilateral RLQ pain raises appendicitis concern
Rebound tenderness
▶
Indicates peritoneal involvement
Raises concern for ruptured TOA or peritonitis
Guarding
▶
Voluntary vs involuntary guarding distinction
Involuntary guarding indicates surgical abdomen
Right upper quadrant assessment
▶
RUQ tenderness
▶
Fitz-Hugh–Curtis perihepatitis
Friction rub possible but rare
Murphy sign
▶
Absence helps distinguish from cholecystitis
Pelvic exam — cornerstone of diagnosis
Speculum examination
▶
Cervical discharge character
▶
Mucopurulent discharge (yellow or green)
Positive swab test — yellow or green mucus on cotton swab in cervical os
Cervical friability
▶
Easily bleeds with contact
Vaginal discharge
▶
Color, odor, quantity
Bimanual examination — minimum diagnostic criteria
▶
Cervical motion tenderness (chandelier sign)
▶
One of three CDC minimum criteria
Sensitivity >95% for upper tract involvement
Uterine tenderness
▶
One of three CDC minimum criteria
Adnexal tenderness
▶
One of three CDC minimum criteria
Any one or more of these three criteria sufficient to initiate empiric treatment per CDC
Adnexal mass or fullness
▶
Suggests TOA
Imaging required when mass palpated
Diagnostic sensitivity and specificity
▶
Clinical diagnosis PPV 65 to 90% compared with laparoscopy
▶
Low threshold preferred to prevent sequelae
Specificity increased by mucopurulent discharge and elevated inflammatory markers
PITFALLS
Missed ectopic pregnancy
▶
Pelvic tenderness can occur in both PID and ectopic
▶
Beta-hCG must be obtained before treating PID
Positive pregnancy test mandates immediate imaging
Occult TOA
▶
Bimanual exam may miss early or posterior TOA
▶
Imaging required when clinical suspicion is high
TOA alters antibiotic duration and disposition
Subclinical PID
▶
Minimal symptoms common — maintain low threshold
▶
Most tubal-factor infertility cases have no prior PID diagnosis
Differential Diagnosis
Life-threatening conditions
Ectopic pregnancy
▶
ICD-10 O00.9
Approximately 40% misdiagnosed at initial visit
Rule out with beta-hCG in all reproductive-age women
Ruptured ovarian cyst with hemoperitoneum
▶
ICD-10 N83.2
Acute onset, often mid-cycle, hemodynamic compromise
Ruptured TOA
▶
ICD-10 N70.93
Peritoneal signs, septic shock
Requires emergent surgical consultation
Appendicitis
▶
ICD-10 K37
Typically RLQ pain, positive Rovsing and McBurney point
CT abdomen or pelvis for definitive evaluation
Common mimics
Ovarian torsion
▶
ICD-10 N83.5
Sudden-onset unilateral pain with nausea or vomiting
Doppler showing absent or reduced ovarian flow
Urinary tract infection or pyelonephritis
▶
ICD-10 N39.0 or N10
Dysuria, frequency, CVA tenderness, positive urinalysis
Endometriosis
▶
ICD-10 N80.9
Chronic or cyclical pain, dysmenorrhea, dyspareunia
No fever or acute inflammatory markers
Diverticulitis
▶
ICD-10 K57.32
Typically LLQ in older patients
CT findings of pericolonic fat stranding
Irritable bowel syndrome with flare
▶
Chronic pattern without inflammatory markers
PID spectrum diagnoses
Pelvic inflammatory disease — uncomplicated
▶
ICD-10 N73.0
SNOMED CT: pelvic inflammatory disease
Tubo-ovarian abscess
▶
ICD-10 N70.93
Complication of PID with abscess formation
Endometritis
▶
ICD-10 N71.0 (acute)
Often early or partial PID spectrum
Fitz-Hugh–Curtis syndrome
▶
ICD-10 A56.11
Perihepatitis complicating PID — RUQ pain with pelvic tenderness
Laboratory Tests
Mandatory initial labs
Pregnancy test
▶
Urine beta-hCG mandatory in all reproductive-age women
▶
Must be obtained before initiating PID treatment
Positive result mandates immediate change in management
STI diagnostics
▶
NAAT for Neisseria gonorrhoeae and Chlamydia trachomatis
▶
Cervical or vaginal swab — most sensitive method
NAAT preferred over culture for sensitivity
Mycoplasma genitalium NAAT where available
▶
Increasingly recognized pathogen
Doxycycline resistance possible — consider moxifloxacin if positive
Wet preparation microscopy
▶
Saline microscopy of vaginal fluid
▶
>1 neutrophil per epithelial cell supports diagnosis
Absence of WBCs makes PID diagnosis unlikely
Clue cells — bacterial vaginosis assessment
Trichomonads identification
Inflammatory and hematologic markers
Complete blood count
▶
Leukocytosis supports infection but not required for diagnosis
▶
Leukopenia indicates severe sepsis
Anemia screen if concern for bleeding
Inflammatory markers
▶
C-reactive protein
▶
Elevated value increases diagnostic specificity
Serial measurement useful if disposition uncertain
Erythrocyte sedimentation rate
▶
Elevated value increases diagnostic specificity
Less specific than CRP but additive
Sepsis labs
▶
Lactate
▶
>=2 mmol/l indicates organ hypoperfusion
Repeat at 2 to 4 hours if elevated
Blood cultures
▶
Obtain before antibiotics when sepsis suspected
Positive in bacteremic TOA or severe PID
Additional labs
Urinalysis
▶
Rule out urinary tract infection as mimic
▶
Pyuria may be present in PID from proximity of inflammation
Urine microscopy if dipstick equivocal
Comprehensive metabolic panel
▶
Renal function — antibiotic dosing adjustment
Hepatic panel — Fitz-Hugh–Curtis hepatic involvement
HIV testing
▶
Recommended in all PID patients per CDC guidelines
▶
HIV increases TOA risk
Syphilis serology
▶
RPR or VDRL recommended with STI screen
▶
Co-infection common in at-risk populations
Diagnostic Tests
Scoring Systems
Clinical diagnostic criteria — CDC 2021
▶
Minimum criteria for empiric treatment
▶
Cervical motion tenderness OR
Uterine tenderness OR
Adnexal tenderness
Any one criterion sufficient in sexually active woman with no other cause identified
Additional criteria that increase specificity
▶
Oral temperature >38.3°C
Mucopurulent cervical or vaginal discharge
WBCs on vaginal wet preparation
Elevated ESR or CRP
NAAT positive for gonorrhea or chlamydia
Definitive criteria (rarely used acutely)
▶
Histopathologic evidence of endometritis on biopsy
Laparoscopic evidence of salpingitis
PID severity classification
▶
Mild to moderate
▶
Able to tolerate oral medications
No peritoneal signs
No TOA
Severe
▶
High fever, nausea, vomiting
Peritoneal signs
TOA or surgical emergency not excluded
Failed outpatient therapy at 72 hours
MRI
MRI pelvis role in PID
▶
Indications
▶
Diagnostic uncertainty after ultrasound
Complex TOA delineation before drainage planning
Staging of associated tubal pathology
Findings suggestive of PID
▶
Thickened fluid-filled fallopian tubes
Tubo-ovarian complex with complex signal
Uterosacral ligament thickening
Free pelvic fluid
Performance
▶
High sensitivity and specificity for TOA
Superior soft tissue contrast vs CT for complex anatomy
Limitations
▶
Expensive and limited availability in ED
Not first-line for acute ED evaluation
Reserved for diagnostic uncertainty or pre-operative planning
CT
CT abdomen and pelvis role
▶
Indications in ED
▶
Diagnostic uncertainty — appendicitis or diverticulitis not excluded
Suspected TOA when ultrasound inconclusive
Septic patient requiring source identification
CT findings in PID and TOA
▶
Uterosacral ligament thickening
Pelvic fat stranding
Reactive lymphadenopathy
Thickened tube walls with fluid
TOA — complex cystic adnexal mass with thick enhancing wall
Free pelvic fluid
Performance
▶
Higher sensitivity than ultrasound for TOA
Can differentiate from appendicitis and diverticulitis
Contrast considerations
▶
IV contrast preferred for soft tissue characterization
Renal function and allergy history review
Evidence and guidance
▶
CT recommended when diagnosis uncertain or TOA suspected
▶
Expert consensus level recommendation
Important when surgical management being considered
Ultrasound
Transvaginal ultrasound — first-line pelvic imaging
▶
Indications
▶
Suspected TOA
Adnexal mass on bimanual exam
Diagnostic uncertainty after clinical exam
Ectopic pregnancy exclusion with positive beta-hCG
Sonographic findings in PID
▶
Thickened fluid-filled fallopian tubes (pyosalpinx)
Hydrosalpinx — dilated tube with fluid
Tubo-ovarian complex — adherent tube and ovary
TOA — complex cystic adnexal mass with internal echoes
Free pelvic fluid
Power Doppler — tubal hyperemia highly suggestive of infection
Performance
▶
Sensitivity fair for early mild PID
Highly specific when positive findings present
TOA detection sensitivity approximately 75 to 82%
Limitations
▶
May miss subtle early PID without structural changes
Operator dependent
Point-of-care ultrasound adjunct
▶
Free fluid identification
▶
Significant free fluid may indicate ruptured TOA or hemoperitoneum
Cardiac assessment if hemodynamically unstable
▶
LV function estimation
IVC assessment for fluid responsiveness
Disposition
Admission indications
CDC 2021 indications for hospitalization
▶
Pregnancy
▶
IV antibiotics required — doxycycline contraindicated
Severe illness
▶
High fever or significant leukocytosis
Nausea and vomiting preventing oral therapy
Unable to tolerate oral medications
Tubo-ovarian abscess
▶
>24 hours inpatient observation minimum
IV antibiotics mandatory
Surgical emergency cannot be excluded
▶
Appendicitis, ruptured ectopic, ovarian torsion still on differential
Failed outpatient therapy
▶
No clinical improvement after 72 hours of oral antibiotics
ICU indications
▶
Septic shock
▶
Vasopressor requirement
Lactate >=2 mmol/l despite 30 ml/kg IV fluid
Ruptured TOA with peritonitis
▶
Emergent surgical intervention
Multiorgan dysfunction
Discharge criteria
Copy
Outpatient eligibility
▶
Mild to moderate symptoms
▶
Tolerating oral medications
Afebrile or low-grade fever
No TOA or surgical emergency
▶
Imaging negative or not indicated
Reliable follow-up arrangement
▶
Return visit within 72 hours arranged
No pregnancy
Adequate social supports and adherence expected
Follow-up requirements
▶
Clinical reassessment within 72 hours mandatory
▶
Assess defervescence and reduction in tenderness
Failure to improve at 72 hours requires hospitalization
Repeat NAAT at 3 months
▶
Regardless of partner treatment status per CDC
Partner treatment coordination
▶
Expedited partner therapy where legally permitted
Specialist consultation
OB/GYN consultation indications
▶
TOA confirmed or suspected
Diagnostic uncertainty between PID and surgical abdomen
Failed medical therapy requiring evaluation for drainage or surgery
Pregnancy complicated by PID
Interventional radiology
▶
TOA failing 72 hours of IV antibiotics
▶
CT or ultrasound-guided percutaneous drainage
Treatment
Outpatient antibiotic regimen
CDC 2021 preferred outpatient regimen
▶
Ceftriaxone 500 mg IM single dose
▶
If weight >150 kg, use ceftriaxone 1 g IM
Plus doxycycline 100 mg PO twice daily for 14 days
▶
Take with food and water to reduce GI side effects
Avoid dairy products within 1 to 2 hours of dose
Plus metronidazole 500 mg PO twice daily for 14 days
▶
Provides anaerobic coverage
Avoid alcohol during therapy (disulfiram-like reaction)
Alternative outpatient regimen
▶
Cefoxitin 2 g IM single dose plus probenecid 1 g PO single dose
▶
Followed by doxycycline 100 mg PO twice daily for 14 days
Plus metronidazole 500 mg PO twice daily for 14 days
Fluoroquinolone regimens
▶
Not recommended first-line due to quinolone-resistant N. gonorrhoeae
May be considered only when all of the following apply
▶
Cephalosporin allergy
Low local gonorrhea prevalence
Reliable follow-up confirmed
NAAT negative for gonorrhea
Inpatient antibiotic regimens
Preferred parenteral regimen A
▶
Ceftriaxone 1 g IV every 24 hours
▶
Continue until 24 to 48 hours of clinical improvement
Plus doxycycline 100 mg PO or IV every 12 hours
▶
Oral preferred due to better bioavailability and less vein irritation
Plus metronidazole 500 mg IV or PO every 12 hours
▶
Particularly important for TOA — anaerobic coverage essential
Alternative parenteral regimen B
▶
Cefotetan 2 g IV every 12 hours
▶
Plus doxycycline 100 mg PO every 12 hours
Or cefoxitin 2 g IV every 6 hours
▶
Plus doxycycline 100 mg PO every 12 hours
Clindamycin plus aminoglycoside regimen
▶
For cephalosporin allergy
Clindamycin 900 mg IV every 8 hours
▶
Excellent anaerobic and gram-positive coverage
Plus gentamicin loading dose 2 mg/kg IV then 1.5 mg/kg IV every 8 hours
▶
Or single daily dosing 5 to 7 mg/kg IV every 24 hours
Renal function monitoring required
Particularly appropriate for TOA per CDC
Transition to oral therapy
▶
After 24 to 48 hours of clinical improvement
▶
Defervescence and reduction in abdominal tenderness
Complete 14 days total course
▶
Doxycycline 100 mg PO twice daily to complete course
Metronidazole 500 mg PO twice daily if indicated
TOA-specific management
Initial antibiotic selection for TOA
▶
Clindamycin plus aminoglycoside may be particularly appropriate
▶
Superior anaerobic coverage for abscess
Or add metronidazole to cephalosporin-doxycycline backbone
▶
Enhances anaerobic coverage
Minimum 14 days total antibiotic duration
Drainage indications
▶
Failing IV antibiotics after 72 hours
▶
Persistent fever and leukocytosis
No reduction in abscess size on imaging
Ruptured TOA — emergent surgical management
▶
OB/GYN emergency
Drainage approaches
▶
CT or ultrasound-guided percutaneous drainage
Transvaginal ultrasound-guided drainage
Laparoscopic drainage if percutaneous not feasible
Adjunctive and supportive measures
Pain management
▶
NSAIDs for mild to moderate pain
▶
Adjunctive only — do not improve clinical outcomes of PID per evidence
Opioid analgesics for severe pain
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Titrate to comfort while monitoring response
IUD management
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IUD does not need to be removed in most cases
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Removal does not hasten resolution and may delay it
All contraceptive methods can be continued during treatment
Consider removal only if no clinical improvement after 72 hours
Partner treatment
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All partners within prior 60 days treated empirically
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Expedited partner therapy where legally permitted
Abstain from intercourse until both partners complete therapy and symptoms resolve
Hydration and supportive care
▶
IV fluids if unable to tolerate oral intake
Antiemetics for nausea
Adequate nutrition during treatment
Special Populations
Pregnancy
Pregnancy and PID
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PID is uncommon after first trimester
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Chorioamniotic membrane seals uterine cavity
First trimester cases require hospitalization
Ectopic pregnancy must be excluded first
▶
Positive beta-hCG with pelvic symptoms requires transvaginal ultrasound immediately
Doxycycline contraindicated in pregnancy
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Hepatotoxicity risk to mother
Fetal teeth and bone effects
Alternative regimen in pregnancy
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Clindamycin 900 mg IV every 8 hours
Plus gentamicin as above
Transition to oral clindamycin 450 mg four times daily after clinical improvement
Hospitalization required for all pregnant patients with PID
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IV antibiotics mandatory
Fetal monitoring if viable gestation
Azithromycin-based alternatives have been used in pregnancy
▶
Not currently a CDC-preferred regimen — consult ID or OB/GYN
Geriatric
Older adult considerations
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PID less common after menopause
▶
Atrophic cervix reduces ascending risk
When it occurs, consider uterine instrumentation or malignancy
Atypical presentation pattern
▶
Afebrile infection possible
Delirium as primary symptom
Minimal pelvic pain despite significant infection
Medication considerations
▶
Renal dose adjustment for aminoglycosides
▶
Reduced creatinine clearance in older adults
Doxycycline esophageal irritation risk — ensure adequate water and upright posture
Metronidazole drug interactions — review CNS and cardiac medications
Comorbidity burden
▶
Diabetes increases TOA risk and severity
Immunosuppression from steroids or biologics increases complications
Disposition bias toward admission
▶
Decreased physiologic reserve
Poorer tolerance of sepsis and limited home supports
Pediatrics
Adolescent and pediatric PID
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High-risk age group — 15 to 25 years accounts for largest burden
▶
Annual chlamydia and gonorrhea screening recommended for sexually active women <25 years
Diagnosis may be delayed
▶
Hesitancy to disclose sexual activity
Atypical presentation more common in adolescents
Treatment regimens same as adults
▶
Ceftriaxone 500 mg IM plus doxycycline 100 mg PO BID 14 days plus metronidazole 500 mg PO BID 14 days
Doxycycline and bone concerns
▶
Short-course doxycycline is acceptable in children >=8 years
CDC guidelines support use in adolescents for PID
Hospitalization threshold lower
▶
Adolescents with TOA require admission
Adherence uncertainty warrants lower threshold for inpatient therapy
Approximately one-third of adolescents with PID experience recurrent STI or PID within 4 years
▶
Sustained risk-reduction counseling essential
Mandatory reporting considerations
▶
Age of consent laws vary by jurisdiction
Child protection assessment if age or consent concerns exist
Background
Epidemiology
Incidence and prevalence
▶
Approximately 1 million cases per year in the United States
▶
Most common gynecologic emergency
Highest in women aged 15 to 25 years
Global burden significant
▶
Leading cause of preventable infertility worldwide
Economic impact
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Estimated cost exceeding $2 billion annually in the US
Causative organisms
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Chlamydia trachomatis and Neisseria gonorrhoeae are classic pathogens
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Gonorrhea detected in approximately 5% and chlamydia in approximately 10 to 15% of cases
Approximately 50% of cases involve vaginal flora polymicrobial mix
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Anaerobes (Bacteroides, Prevotella)
Mycoplasma genitalium — emerging resistant pathogen
Enteric gram-negative organisms
Bacterial vaginosis flora strongly associated
Sequelae and outcomes
▶
Infertility
▶
Approximately 8% after first PID episode
Approximately 20% after second episode
Approximately 40% after third episode
Ectopic pregnancy risk increased 6 to 10-fold after PID
Chronic pelvic pain in approximately 18% of cases
Fitz-Hugh–Curtis perihepatitis in approximately 10 to 20% of cases
Recurrence rates high — approximately one-third of adolescents within 4 years
Pathophysiology
Ascending infection mechanism
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Normal cervical mucus barrier disrupted
▶
STIs, vaginal flora imbalance, or mechanical disruption (IUD insertion, instrumentation)
Ascending colonization of endometrium
▶
Endometritis — first stage
Fallopian tube involvement
▶
Salpingitis — ciliated cells damaged
Ciliary dysfunction impairs egg transport
Ovarian involvement
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Oophoritis — ovary involved via contiguous spread
Tubo-ovarian abscess formation
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Walled-off pelvic infection
Anaerobic bacteria predominate in established abscess
Peritoneal spread
▶
Pelvic peritonitis
Fitz-Hugh–Curtis — ascending to hepatic capsule via right paracolic gutter
Inflammatory injury
▶
Cytokine-mediated tubal damage
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Fibrosis and adhesion formation
Tubal occlusion causing infertility and ectopic pregnancy risk
Subclinical PID concept
▶
Significant tubal damage can occur without classic symptoms
Most women with tubal-factor infertility have no recognized prior PID
Therapeutic Considerations
Antibiotic strategy principles
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Empiric polymicrobial coverage essential
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Single-organism coverage insufficient
Regimens must cover gonorrhea, chlamydia, and anaerobes
14-day course required for all regimens
▶
Shorter courses associated with higher treatment failure
Mycoplasma genitalium doxycycline resistance concern
▶
Consider moxifloxacin 400 mg PO daily for 14 days if M. genitalium positive and doxycycline fails
Fluoroquinolone resistance in N. gonorrhoeae widespread
▶
Fluoroquinolones no longer acceptable empiric first-line
Importance of low threshold for treatment
▶
CDC emphasizes empiric treatment to prevent sequelae
▶
Class I recommendation
Delay in treatment strongly associated with infertility and chronic pain
Clinical diagnosis preferred over waiting for confirmatory tests
▶
PPV of clinical diagnosis 65 to 90% vs laparoscopy
IUD management evidence
▶
Removal of IUD not associated with improved outcomes
▶
Remove only if no improvement after 72 hours of antibiotics
Post-IUD insertion risk returns to baseline after 3 to 6 weeks
Prevention
▶
Annual chlamydia and gonorrhea screening for sexually active women <25 years
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USPSTF Grade B recommendation
Expedited partner therapy reduces reinfection rates
Condom use and barrier methods
Patient Discharge Instructions
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Diagnosis and antibiotic instructions
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Pelvic inflammatory disease (PID) — infection of uterus, fallopian tubes, and ovaries
Take all antibiotics exactly as prescribed for the full 14 days
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Doxycycline 100 mg twice daily — take with food and a full glass of water
Avoid dairy products within 2 hours of doxycycline dose
Metronidazole 500 mg twice daily — avoid all alcohol during treatment
Do not stop antibiotics early even if you feel better
Activity and precautions
▶
No sexual intercourse until you and your partner(s) have both completed treatment and symptoms have resolved
All sexual partners from the past 60 days need to be treated
Avoid alcohol while taking metronidazole — it causes severe nausea and flushing
Follow-up instructions
▶
Return to clinic or see your doctor in 72 hours (3 days) to check that treatment is working
Repeat STI testing recommended at 3 months
Discuss STI prevention and regular screening with your doctor
Warning signs — return to the emergency department immediately if you experience
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Worsening or severe abdominal or pelvic pain
High fever — temperature above 38.5°C (101°F)
Shaking, chills, or feeling very unwell
Fainting, dizziness, or rapid heartbeat
Inability to keep medications or fluids down
Severe vomiting or diarrhea
New pain in your right shoulder or right upper abdomen
No improvement in symptoms after 48 to 72 hours of antibiotics
General recovery advice
▶
Adequate rest during treatment
Stay hydrated
Eat regular meals — taking antibiotics on an empty stomach increases nausea
Inform recent sexual partners — you can ask your healthcare provider about expedited partner therapy
References
Guidelines and key sources
Primary guidelines
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CDC Sexually Transmitted Infections Treatment Guidelines 2021 — Workowski KA et al, MMWR 2021
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Primary source for diagnosis criteria and treatment regimens
Brunham RC, Gottlieb SL, Paavonen J — Pelvic Inflammatory Disease, NEJM 2015
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Comprehensive review of pathophysiology, epidemiology, sequelae
Savaris RF et al — Antibiotic Therapy for Pelvic Inflammatory Disease, Cochrane Database 2020
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Systematic review comparing antibiotic regimens
Supporting evidence
▶
Boyens H et al — Interventions for Tubo-Ovarian Abscess, Cochrane Database 2025
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Evidence for drainage vs antibiotic alone for TOA
Chen F et al — Moxifloxacin monotherapy for uncomplicated PID, Pharmacoepidemiology and Drug Safety 2023
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Role of moxifloxacin and Mycoplasma genitalium coverage
Revzin MV et al — PID Multimodality Imaging, Radiographics 2016
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Imaging findings across ultrasound, CT, and MRI for PID and TOA
Frock-Welnak DN, Tam J — Identification and Treatment of Acute PID, Obstet Gynecol Clin North Am 2022
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ED-focused review of clinical approach and management
Additional references
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Tuddenham S, Hamill MM, Ghanem KG — STI Diagnosis and Treatment Review, JAMA 2022
Curry A, Williams T, Penny ML — PID Diagnosis, Management, and Prevention, Am Fam Physician 2019
Trent M et al — Subsequent STI After Outpatient Treatment of PID, Arch Pediatr Adolesc Med 2008
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Adolescent recurrence rates data
Klein DA et al — STI Updated Guideline From the CDC, Am Fam Physician 2022
Coding standards
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ICD-10 N73.0 — acute parametritis and pelvic cellulitis
ICD-10 N70.93 — tubo-ovarian abscess
ICD-10 A56.11 — chlamydial peritonitis (Fitz-Hugh–Curtis)
SNOMED CT — pelvic inflammatory disease disorder concept
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.
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Management Protocols
Pelvic Inflammatory Disease (PID)