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von Willebrand Factor Antigen

Justification

von Willebrand Factor (VWF) Antigen should be ordered as part of a von Willebrand Disease (VWD) workup. Decreases in VWF Antigen level are consistent with von Willebrand Disease. Additional testing, including but not limited to Ristocetin Cofactor Activity, Factor VIII Activity, VWF Multimer, and VWD Complete genetic sequencing, is required for confirmation and subtyping of VWD.

STAT: < 24 hours (7 days a week)

LIA

Draw Tube: Blue Top

Sample Type: Citrated Plasma

Specimen Requirements

Sample Type Volume Required Minimum Volume Stability
PREFERRED Citrated Plasma 1mL 0.5mL Room Temp.: 2 hours
Refrigerated: 2 hours
Frozen (-20C): 2 weeks
Frozen (-80C): 6 months
ALTERNATIVE - - - -
REJECTION CRITERIA Thawed in transit, refrozen or clotted sample
SPECIAL INSTRUCTIONS -

General Information

METHODOLOGY LIA
STAT TAT < 24 hours (7 days a week)
STAT TAT Performance > 90% of results released in 24 hours 7 days a week
ROUTINE TAT < 3 days (M-F)
ALTERNATIVE NAMES VWF Antigen
DESCRIPTION Latex Immunoassay for the measurement of von Willebrand Factor Antigen
LIMITATIONS -
NORMAL RANGE 50-160
ASSOCIATED TESTING -
REFERENCES -
SAMPLE REPORT Upon request
NEW YORK STATE APPROVED -

Test Codes

ORDER CODE P3119
CPT CODE 85246
LOINC CODE 27816-8