Apr 7, 2015




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von Willebrand Disease Type 2B Evaluation

von Willebrand Disease Type 2B Evaluation (HCVW2B) Blood Center of SE WI Lab Test

Name: von Willebrand Disease Type 2B Evaluation

Test Name: von Willebrand Disease Type 2B Evaluation

Health Link Test Code: HCVW2B

LIS Test Code: VW2B

Test Component:

VWD Type 2B Binding von Willebrand Factor Multimers

Testing Site: Testing will be sent to an approved reference laboratory

In-Lab Turnaround Time: 1 - 2 weeks.

Specimen: Blood

Collection Container: Light blue top (3.2% NaCitrate)

Collection Instructions:

Do NOT draw through a line containing heparin. The venipuncture MUST be atraumatic to avoid hemolysis and contamination with tissue factor and platelets. Tube must be allowed to fill completely.

Collection Volume: 3.5 mL

Stability Ambient:

Not acceptable

Stability Refridgerated:

Not acceptable

Stability Frozen:


Sample Analyzed: Plasma

Testing Volume: 1.5 mL

Pediatric Testing Volume: 1 mL

Specimen Processing:

Centrifuge specimen to yield platelet poor plasma (platelet count should be less than 10 K/uL). Separate plasma and transfer to plastic tube or vial as follows. Two aliquots must be submitted. For adults, one 0.5 mL and one 1.0 mL aliquot. For pediatrics, one 0.2 mL and one 0.7 mL aliquot.


Freeze plasma within 4 hours of collection at -20°C or below.

Specimen Transport:

Transport whole blood specimen at room temperature to laboratory within 4 hours of collection. See Specimen Processing for instructions if transport criteria are not met. Transport frozen plasma aliquots on dry ice to UWHC Hospital Laboratory.