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Von Willebrand Factor Activity (GP1bM; Ristocetin-free)

Justification

VWF:GPIbM is considered to be more sensitive that the traditional VWF:RCo assay due to a recombinant mutation in GPIb in the assay reagent. Ristocetin is not needed due to the gain-of-function mutation in the reagent. The test is recommended for patient suspected of having very low levels (<20%) of VWF activity.

STAT: < 1 week

ELISA

Draw Tube: Blue Top

Sample Type: Citrated Plasma

Specimen Requirements

Sample Type Volume Required Minimum Volume Stability
PREFERRED Citrated Plasma Two aliquots, 1mL each Two aliquots, 0.5mL each 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 ELISA
STAT TAT < 1 week
STAT TAT Performance > 90% of results released in 1 week
ROUTINE TAT < 1 week
ALTERNATIVE NAMES Rco
DESCRIPTION -
LIMITATIONS -
NORMAL RANGE -
ASSOCIATED TESTING -
REFERENCES -
SAMPLE REPORT Upon request
NEW YORK STATE APPROVED -

Test Codes

ORDER CODE P3381
CPT CODE 85397
LOINC CODE 6014-5