VWF GPIbM Activity Test

VWF GPIbM Activity is a ristocetin-independent activity assay and is an alternative to VWF Ristocetin Cofactor Activity with superior precision and sensitivity. VWF:GPIbM Activity, order code 1990, automatically applies the appropriate assay methodology based upon the patient's age at the time of sample collection. VWF GPIbM Activity methodology cannot be changed upon request. When the VWF GPIbM Activity is ordered, one of the following assays will be performed: (a) VWF GPIbM Activity performed by ELISA and is offered for patients <6 months of age. (b) VWF GPIbM Activity performed by Turbidimetric latex-based assay and is offered for patients >/=6 months of age. USA test status for ELISA method: This is a laboratory developed test (LDT). USA test status for Turbidimetric latex-based method: This is an In Vitro Diagnostic test (IVD).

von Willebrand Disease

Citrated Plasma (light blue top)

1 ml

0.5 ml

ELISA for patients <6 months of age. Turbidimetric latex-based assay for patients >/=6 months of age.

7 days

Yes

No