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HelpTest Code 5472206 VON WILLEBRAND FACTOR ACTIVITY -RISTOCETIN COFACTOR
Test ID
1233000006
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 ASSAY | 1230000568 | 53622-7 (von Willebrand factor cleaving protease actual/normal:RelCCnc:Pt:PPP:Qn:Chromo) |
| VON WILLEBRAND ACTIVITY/ANTIGEN RATIO | 1230002282 |