Test Details
Mnemonic
VWFAR
Ordering Code
3619200
CPT-4 Code(s)
85245
Specimen Information
Patient Preparation
Follow coagulation testing collection methods in appendices.
Collect
Light blue sodium citrate
Specimen Preparation
Send 1.5 mL plasma in a screw capped plastic vial. CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
Minimum Volume
1.0 mL
Transport Temperature
Critical frozen
Rejection Criteria
Serum, non-frozen or hemolyzed specimens, EDTA plasma
Stability
Room temperature: 4 hours
Refrigerated: Unacceptable
Frozen: 3 months
Refrigerated: Unacceptable
Frozen: 3 months
Methodology
Platelet Agglutination
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%
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%
Performing Laboratory
ARUP Reference Laboratory
New York DOH Approval Status
Yes