VON WILLEBRAND FACTOR ACTIVITY

Mnemonic

<b><span style='color:red'><u>VONRIS</span></u></b>

Synonym

(Ristocetin Co-factor - von Willebrand Factor - RAF - VWF Factor - R:CoF - von Willebrand Factor Activity - VWF

Specimen Collection Requirements

Collect

Whole Blood or Plasma, two light blue (3.2% Buffered Sodium Citrate) top tubes

Preferred Volume

Two 1.0 mL aliquots

Minimum Volume

One 1.0 mL aliquot

Transport

Frozen

Rejection Criteria

Clotted samples, samples collected in containers other than 3.2% Buffered Sodium Citrate, tubes filled less than 90%, samples from patients with a Hematocrit greater than 55%, hemolyzed samples due to ex-vivo causes (i.e., difficult draw, poor sample draw), whole blood samples that were frozen before processing

Stability

WHOLE BLOOD Ambient: 4 hours. PLASMA: Ambient: 4 hours; Frozen: -20°C 2 weeks, -70°C 6 months

Testing Information

Performed

Tues, Thurs

Method

Platelet Agglutination

Referral Lab

Legacy Laboratory Services

Reference Values

Reference Values

Varies, see report

CPT Codes

85245

Last Updated: Thursday, January 5, 2017 03:42:34 AM