Management of Suspected von Willebrand Disease with Elevated PT and aPTT

Initial Diagnostic Approach

The American Society of Hematology suggests that a complete VWD workup, including VWF:Ag, VWF:RCo, and FVIII levels, is necessary for proper diagnosis and management of suspected VWD, as prolonged PT and aPTT alone are insufficient for diagnosis 1
The ratio of VWF:RCo to VWF:Ag is crucial for determining VWD subtype, with a ratio below 0.5-0.7 suggesting a qualitative VWD variant, according to the American Journal of Hematology 1
Proper sample collection and processing conditions are essential, as they significantly affect test results, and should be handled at room temperature with prompt processing, as recommended by the British Journal of Haematology, although the specific reference is from Praxis Medical Insights 2

The American College of Cardiology indicates that a prolonged PT suggests potential issues in the extrinsic pathway, which may be relevant in the context of suspected VWD 3
The combination of prolonged PT and aPTT warrants consideration of multiple factor deficiencies, liver dysfunction, disseminated intravascular coagulation (DIC), and the presence of anticoagulants, as suggested by the British Journal of Anaesthesia and the American College of Cardiology 3, 5
Severe VWD, especially type 3, can present with prolonged aPTT, according to Pediatrics 4

The Journal of Thrombosis and Haemostasis recommends a complete blood count to assess for thrombocytopenia in patients with suspected VWD 6
Fibrinogen level and thrombin time should be evaluated to assess for fibrinogen disorders, as suggested by the British Journal of Anaesthesia and Pediatrics 4, 5
VWF multimer analysis is important for subtyping VWD, although not for initial screening, as recommended by the American Journal of Hematology 1
ABO blood group determination is necessary, as it affects VWF levels, according to the Journal of Thrombosis and Haemostasis 6

For acute bleeding or preparation for procedures, the target VWF activity level should be ≥50 IU/dL for most procedures, and response to desmopressin should be documented with pre- and post-treatment VWF and FVIII levels, as recommended by Praxis Medical Insights, although this is not the preferred source, the information is relevant 2
VWF concentrate replacement may be necessary for patients with severe VWD or those unresponsive to desmopressin, according to the American Journal of Hematology 1
Tranexamic acid can be used as adjunctive therapy, particularly for mucosal bleeding, as suggested by the Journal of Thrombosis and Haemostasis and Praxis Medical Insights 2, 6
For severe bleeding, factor levels should be maintained with appropriate replacement therapy, according to the British Journal of Anaesthesia 5

Patient factors such as stress, inflammation, pregnancy, and oral contraceptives can affect test results by elevating VWF and FVIII levels, potentially masking VWD, as noted by Praxis Medical Insights, although the preferred source would be a different journal, the information is relevant 2
Recent exercise can transiently increase VWF levels, according to Praxis Medical Insights, which, although not the preferred source, provides relevant information 2