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von Willebrand Screen
MessagePerformed in the Hematology Laboratory x5475, 76
Sample MUST be drawn to minimum fill line on tube
Sample MUST be drawn to minimum fill line on tube
Test Code
VWSCR
CPT Codes
No Code
Includes
APTT, Von Willebrand Factor Antigen, Von Willebrand Factor Activity, Factor VIII assay, and Fibrinogen
Preferred Specimen
plasma
Minimum Volume
2 mL plasma. Sample MUST be drawn to minimum fill line on tube or the sample will be rejected as QNS.
Transport Container
2, Light Blue Top (Sodium Citrate), 2.7 mL draw
Transport Temperature
Room Temperature
Specimen Stability
Refrigerator Stability: 4 hours
Plasma is stable for 6 months frozen at -70C
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis, QNS, clotted
Methodology
Refer to individual tests for methodology.
Setup Schedule
2-3x/week, weekdays between 8-4pm. Plasma is frozen until testing is performed.
Reference Range
Refer to individual tests.
Clinical Significance
Evaluate the bleeding patient for von Willibrand disease.
