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Outpatient Laboratory Services

Laboratory Outreach Program

Mayo Clinic Laboratories

Test Code 5472201 VON WILLEBRAND FACTOR ANTIGEN

Test ID

1233000007

Specimen Requirements

Collection Requirements	Specimens should be collected in 2-3 mL 3.2% sodium citrate (light blue top) tubes from peripheral veins, when possible. When drawn from an indwelling line, 5 ml saline flush followed by 5 ml discard tube should be performed. Do not under or over-fill collection tubes. Gently invert the tube end-over-end 8-10 times. If hematocrit is >55%, contact coagulation lab prior to sample collection.
Shipping / Handling Instructions	Outpatient specimens: Specimens should be centrifuged and frozen within 4 hours of collection to generate platelet-poor plasma. A minimum of 0.5 ml frozen citrated plasma is needed per test ordered. Inpatient specimens: Transport at room temperature. Specimens should be received in lab within 2 hours of collection.

Container Type

Laboratory	Container	Default	Temperature	Minimum Volume
CUH LAB	BLUE-NA CITRATE	Yes	Frozen	1.5

Performing Section

CUH LAB: CUH COAG

Components

Component Name	Component ID	LOINC Code
VWF ANTIGEN	1230000569	27816-8 (von Willebrand factor Ag actual/Normal:RelMCnc:Pt:PPP:Qn:IA)