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HelpTest Code LAB1111 Von Willebrand Factor (vWF) Multimer
Additional Codes
| BCW Test ID |
|---|
| 1063 |
Performing Laboratory
Specimens referred to: Blood Center of Wisconsin (BCW)
Specimen Requirements
SPECIMEN MUST ARRIVE IN LABORATORY WITHIN 3 HOURS OF COLLECTION
Patient Preparation: If possible, include result of von Willebrand factor antigen with specimen
Container/Tube
Preferred/Acceptable: Light blue-top (Citrate) tube (2.7 mL or 1.8 mL)
Collection Volume: Tube should be full
(Full is to marking on tube label. MINIMUM tube volume for collection is to marking on tube label but may go above line)
Submission Container/Tube: If specimen is coming from outside facility either send specimen in orginal container STAT so can be processed within 4 hour stability or process and send to lab STAT in dry ice (processing instructions below)
Special Instructions:
|
1. |
Draw a discard tube prior to light-blue top tube. |
|
2. |
Tube(s) should remain stoppered. Allow vacutainer to fill by vacuum completely |
|
3. |
Immediately invert tube/microtainer® gently 8-10 times after collection to ensure proper mixing of blood and anticoagulant (this will avoid specimen clotting). Forward promptly at ambient temperature only. |
|
4. |
DO NOT underfill tube(s) |
|
5. |
Avoid hemolysis and heparin contamination of specimen. Blood should NOT be collected through an indwelling catheter or an A-V shunt. |
Sample Rejection
Vacutainer®(s) that are under-filled/insufficient specimen
Clotted specimens.
Mislabeled or unlabeled specimens.
Logistics
Test Availability: Monday-Sunday
Days set-up by reference lab: Varies
Turnaround Time: 7-10 days after receipt in performing laboratory
Reference Values
Reference Interval: An interpretive report will be provided
Critical Value: None established
Methodology
Electrophoresis
Limitations
- NA
Additional Information
FOR SLCH CORE LABORATORY USE ONLY
Lab Processing Instructions: Centrifuge specimen for 15 minutes. Transfer top two-thirds of plasma (minimum volume 0.5 mL) into a labeled 5-mL screw-capped, plastic vial for transport. Place aliquot vial in dry ice to freeze immediately.
Processed Volume: Send minimum of 0.4 mL citrated plasma
Transport temperature: Frozen
Analyte Stability:
| Specimen Type | Temperature | Time |
|---|---|---|
| Whole Blood (unprocessed) | Ambient | 4 hours |
| Plasma (processed off cells) | Refrigerated | NA |
| Ambient | NA | |
| Frozen (prefered) | NA |
NOTE: Ship specimen direct to BCW on dry ice Monday-Thursday only.
Test Classification and CPT Code
85247
LOINC
NA
Last Reviewed
07/2025