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Test Code LAB20666 Von WilleBrand Factor Activity (Ristocetin CoFactor)

Department

Send Outs

Reference Lab Test Number

VWFAR

Collection Requirements

Follow coagulation testing collection methods in appendices.

Refer To

Warde Medical Laboratory

Primary Collection Container

Blue 2.7 mL (Citrate)

Transport

Plasma Frozen

Preferred Transport Temperature

Frozen

Processing

Send in a screw capped plastic vial. CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.

Stability

Ambient: 4 hours

Refrigerated: Unaccetpable

Frozen: 3 months

Minimum Testing Volume

1.0 mL

Reference Range

0 – 6 years: 51 – 215%

7 – 9 years: 52 – 176%

10 – 11 years: 60 – 195%

12 – 13 years: 50 – 184%

14 – 15 years: 50 – 203%

16 – 17 years: 49 – 204%

18 years and older: 51 – 215%

Methodology

Platelet Agglutination

Performed

Monday-Saturday

Reported

4-7 days

CPT Codes

85245

Unacceptable Conditions

Serum, non-frozen or hemolyzed specimens, EDTA plasma