›Hemophilia B (low factor IX; X-linked; similar to hemophilia A clinically)
›Platelet function disorders (Glanzmann thrombasthenia, Bernard-Soulier syndrome; mucocutaneous bleeding similar to VWD; distinguished by platelet aggregation studies)
Acquired Coagulopathy
›Acquired bleeding disorders
›Acquired von Willebrand syndrome (lymphoproliferative disorders, aortic stenosis, hypothyroidism, autoimmune disease; new-onset bleeding in older adults without family history)
›Ehlers-Danlos syndrome (connective tissue disorder with easy bruising; normal coagulation)
05Laboratory Tests/lt24
First-Line Coagulation Panel
›Initial diagnostic laboratory studies
›Complete blood count with platelet count (thrombocytopenia in type 2B)
›PT/INR (usually normal in VWD; prolonged in liver disease or DIC)
›aPTT (may be prolonged if FVIII is significantly reduced, particularly in types 2N and 3)
VWF-Specific Testing
›Confirmatory VWD laboratory panel
›VWF antigen (VWF:Ag): quantifies total VWF protein concentration
›Definite VWD: VWF:Ag less than or equal to 30 IU/dL
›Low VWF or possible VWD: 30-50 IU/dL
›VWF activity (VWF:RCo, VWF:GPIbR, or VWF:GPIbM): measures platelet-binding function
›Factor VIII activity (often reduced in types 2N and 3; may be very low in type 3)
Subtyping Tests
›Second-line VWD classification studies
›VWF activity to VWF:Ag ratio
›Ratio less than or equal to 0.6 suggests type 2 qualitative defect
›VWF multimer analysis (distinguishes subtypes 2A, 2B, 2M; absent large multimers in 2A)
›Low-dose ristocetin-induced platelet aggregation (RIPA): enhanced aggregation in type 2B
›VWF:FVIII binding assay (abnormal in type 2N)
›VWF propeptide assay (helps distinguish type 1 from type 3; elevated ratio indicates increased clearance)
Adjunct Laboratory Studies
›Supporting laboratory investigations
›Iron studies and ferritin (chronic blood loss from menorrhagia or GI bleeding)
›Type and screen (anticipate transfusion in moderate/severe bleeding)
›ABO blood group (blood group O associated with approximately 25% lower VWF levels)
›Thyroid function tests (hypothyroidism lowers VWF levels; particularly in acquired presentations)
›Peripheral blood smear (schistocytes in TTP/DIC; lymphoma cells in acquired vWS)
›Hepatic function panel (synthetic function assessment for coagulopathy)
06Diagnostic Tests/dt20
Scoring Systems
›ISTH Bleeding Assessment Tool (BAT)
›Standardized scoring system for bleeding symptom severity quantification
›Useful for screening and diagnosis of bleeding disorders in clinic settings
›Limitations include cumulative scoring and age-dependent thresholds
›Abnormal BAT score increases probability of VWD diagnosis in symptomatic patients
MRI
›MRI indications in VWD
›Joint MRI for hemarthrosis characterization and arthropathy staging in severe disease
›Brain MRI for subacute intracranial hemorrhage or venous sinus thrombosis evaluation
›MRI superior to plain radiographs for early synovial and cartilaginous joint damage detection
›MRI abdomen/pelvis for retroperitoneal hematoma delineation when CT contrast contraindicated
CT
›CT indications by hemorrhage site
›CT head without contrast for acute intracranial hemorrhage (indication: headache, altered mental status, focal neurological deficits)
›CT abdomen and pelvis with contrast for suspected intra-abdominal or retroperitoneal hemorrhage
›CT angiography for localizing active arterial GI hemorrhage
›Not indicated for VWD diagnosis itself; used for complication assessment
Ultrasound
›Point-of-care and formal ultrasound applications
›FAST exam for intraperitoneal free fluid in hemodynamically unstable patients
›Joint ultrasound for hemarthrosis detection and aspiration guidance
›Soft tissue ultrasound for hematoma assessment and compartment syndrome evaluation
›Transthoracic echocardiography in acquired VWS to evaluate for aortic stenosis (jet velocity greater than 4 m/s or valve area less than 1.0 cm2 associated with high-shear VWF proteolysis)
07Disposition/dispo21
Admission Indications
›Criteria for inpatient admission
›Hemodynamically significant active hemorrhage requiring IV factor replacement
›Intracranial hemorrhage (ICU-level care required)
›GI hemorrhage (hemodynamically significant or requiring endoscopic intervention)
›VWD management in pregnancy and the peripartum period
›Physiologic changes in pregnancy
›VWF levels rise during pregnancy (especially in third trimester); type 1 patients may have near-normal levels at term
›VWF levels may NOT rise in type 3 and some type 2 subtypes; do NOT assume hemostatic cover without testing
›Postpartum drop in VWF levels creates highest-risk period for hemorrhage (days 1-5 postpartum)
›Antepartum management
›VWF:RCo and FVIII activity at 28-34 weeks gestation to guide delivery planning
›Hematology consultation recommended for all VWD patients in pregnancy
›Target VWF:RCo and FVIII greater than 50 IU/dL for vaginal delivery; greater than 100 IU/dL for cesarean section
›Postpartum hemorrhage
›Reported in 6-59% of women with VWD (vs. 1-5% in general population)
›Tranexamic acid 1 g IV at delivery as prophylaxis (Class I evidence for postpartum hemorrhage)
›VWF/FVIII concentrate if VWF levels insufficient at delivery
›Desmopressin use with caution postpartum (fluid restriction feasibility limited by breastfeeding)
›Neuraxial anesthesia considerations
›Epidural and spinal anesthesia generally safe if VWF:RCo and FVIII greater than 50 IU/dL
›Anesthesia team must be informed of VWD subtype and current hemostatic levels
Geriatric
›VWD considerations in elderly patients
›Acquired von Willebrand syndrome prevalence
›New-onset bleeding in older adults without family history should prompt evaluation for lymphoproliferative disorder, aortic stenosis, or hypothyroidism
›Aortic stenosis (valve area less than 1.0 cm2) causes high-shear proteolysis of large VWF multimers
›GI angiodysplasia
›Most common life-threatening complication in elderly type 2 and type 3 patients
›Heyde syndrome: aortic stenosis combined with GI angiodysplasia and acquired VWS
›Upper and lower endoscopy for active GI hemorrhage evaluation
›Desmopressin cautions in elderly
›Increased risk of hyponatremia and cardiovascular complications (coronary artery disease)
›Prefer VWF concentrate in elderly with known or suspected coronary artery disease
›Type 2M: reduced platelet-dependent VWF function without multimer loss
›Type 2N: impaired VWF-FVIII binding; mimics hemophilia A with low FVIII but normal VWF:Ag
›Type 3 VWD pathophysiology
›Near-complete or complete absence of VWF (homozygous or compound heterozygous mutations)
›Severe mucocutaneous and joint bleeding; FVIII critically low (secondary to VWF deficiency)
›Risk of VWF alloantibody (inhibitor) development with repeated VWF concentrate exposure
Therapeutic Considerations
›Evidence base for VWD treatment
›Desmopressin mechanism
›Stimulates Weibel-Palade body release of stored VWF from endothelial cells
›Raises VWF and FVIII 2-4 fold for 8-12 hours; first confirmed with desmopressin challenge test
›Challenge test: 1-hour and 4-hour VWF levels; responder defined as greater than or equal to 2-fold increase to greater than 50 IU/dL sustained at 4 hours
›VWF/FVIII concentrate evidence
›European Journal of Haematology 2022 cohort study confirms long-term prophylaxis with pdFVIII/VWF concentrate reduces bleeding episodes in severe VWD
›Recombinant VWF (Vonvendi) approved by FDA for adults 18 years and older; no transmitted infection risk
›Antifibrinolytic therapy evidence
›Tranexamic acid inhibits plasminogen activation; effective as stand-alone for minor mucosal bleeding
›Adjunctive role with desmopressin or factor concentrate for moderate/severe bleeding
›ASH/ISTH/NHF/WFH joint guidelines (2021) on heavy menstrual bleeding
›Hormonal therapy (combined oral contraceptives or levonorgestrel IUD) recommended over desmopressin as first-line for HMB management
11Patient Discharge Instructions/pdi27
copy discharge instructions
›Von Willebrand Disease discharge instructions
›Condition overview
›Your bleeding disorder means your blood does not clot normally
›You may bleed longer than usual from cuts, dental work, or minor injuries
›Carry your medical alert identification at all times
›Medications
›Take tranexamic acid as prescribed to reduce mucosal bleeding
›Do NOT take aspirin, ibuprofen, naproxen, or other NSAIDs; use acetaminophen for pain instead
›Do not start any new medications or supplements (including fish oil, vitamin E, turmeric) without discussing with your hematologist
›Activity restrictions
›Avoid contact sports and high-risk activities that increase injury risk
›Use protective equipment (helmets, pads) for any physical activity
›Bleeding that does not stop after 15-20 minutes of direct firm pressure
›Nosebleed that does not stop after 30 minutes or causes difficulty breathing
›Blood in vomit, stool (black or red), or urine
›Severe headache, sudden vision changes, confusion, weakness, or numbness
›Swollen, painful joint after minor injury (possible hemarthrosis)
›Lightheadedness, fainting, or rapid heart rate
›Heavy menstrual bleeding soaking more than one pad per hour for two or more consecutive hours
›Signs of severe anemia: extreme fatigue, shortness of breath at rest, chest pain
›Follow-up
›Hematology appointment within 1-2 weeks of this visit
›Annual comprehensive review at a bleeding disorders center (CBC, iron studies, VWF levels)
›Ensure hepatitis B vaccination is up to date
›Carry your treatment plan and factor products when traveling
12References/r17
Guidelines and Key Sources
›Primary clinical guidelines and landmark references
›Seidizadeh O, Eikenboom JCJ, Denis CV, et al. Von Willebrand Disease. Nature Reviews Disease Primers. 2024. PMID 39054329
›Leebeek FW, Eikenboom JC. Von Willebrand Disease. New England Journal of Medicine. 2016. https://www.nejm.org/doi/full/10.1056/NEJMra1601561
›Castaman G, Katsarou O, Jansen N, et al. Clinical, economic, and health-related quality of life burden associated with von Willebrand disease in adults and children. Haemophilia. 2023. https://onlinelibrary.wiley.com/doi/10.1111/hae.14655
›Rugeri L, Harroche A, Repessee Y, et al. Effectiveness of long-term prophylaxis using pdFVIII/VWF concentrate in patients with inherited von Willebrand disease. European Journal of Haematology. 2022. https://onlinelibrary.wiley.com/doi/10.1111/ejh.13778
›Jones DE, Walker JJ, Abellada AMP. Hematologic Emergencies: Recognition and Initial Management. American Family Physician. 2024. PMID 39028783
›Srivaths L, Kouides PA. Low von Willebrand Factor in Children and Adolescents: A Review. JAMA Pediatrics. 2021. https://jamanetwork.com/journals/jamapediatrics/fullarticle/10.1001/jamapediatrics.2021.2186
›Castaman G. How I Treat Von Willebrand Disease. Thrombosis Research. 2020. PMID 32819724
›Mohinani A, Patel S, Tan V, et al. Desmopressin as a hemostatic and blood sparing agent in bleeding disorders. European Journal of Haematology. 2023. https://onlinelibrary.wiley.com/doi/10.1111/ejh.13930
›Johnsen J. Von Willebrand Disease. GeneReviews [Internet]. 2024. https://www.ncbi.nlm.nih.gov/books/n/gene/von-willebrand/
›Tosetto A, Castaman G. How I Treat Type 2 Variant Forms of Von Willebrand Disease. Blood. 2015. PMID 25477497
›Sharma R, Haberichter SL. New Advances in the Diagnosis of Von Willebrand Disease. Hematology American Society of Hematology Education Program. 2019. PMID 31808831
›Yawn B, Nichols WL, Rick ME. Diagnosis and Management of Von Willebrand Disease: Guidelines for Primary Care. American Family Physician. 2009. PMID 19961139
Additional Sources
›Supporting references
›Castaman G, Borchiellini A, Coppola A, et al. Use of the von Willebrand factor concentrate with low factor VIII content in patients with inherited von Willebrand disease. European Journal of Haematology. 2022. https://onlinelibrary.wiley.com/doi/10.1111/ejh.13785
›Rare bleeding disorders: Advances in management. Haemophilia. 2024. https://onlinelibrary.wiley.com/doi/10.1111/hae.14986
›Gary M. Woods, Robert F. Sidonio. Coagulation concentrates for inherited bleeding disorders. Rossi Principles of Transfusion Medicine 6e. 2022. https://onlinelibrary.wiley.com/doi/10.1002/9781119719809.ch37
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