VON WILLEBRAND COAGULATION PANEL

Mnemonic

VON

Synonym

VW Panel

Includes

PT/PTT, Factor VIII: C, VWF Activity, VWF Antigen

Guidelines

Test not recommended if patient is on anticoagulant therapy.

Specimen Collection Requirements

Collect

Whole Blood light blue top tube (3.2% Buffered Sodium Citrate)

Handling

For detailed specimen collection and handling, see Coagulation Specimen Collection Guidelines.

If the patient is on medication, list the medications on the lab requisition. Patient should not have received blood products in the previous 2 weeks. Due to short stability, whole blood specimen tubes must reach the testing department within 4 hours, otherwise submit frozen plasma aliquots. If submitting whole blood, transport at ambient temperature (15-25°C) in original unopened tube. If submitting frozen plasma aliquots, specimens must remain frozen (-20°C) during transport.

STAT Requests: Available 7 days/week. Must notify Special Coagulation Department (503 413-5120) to make arrangements. Specimen must be received by 2 pm at Legacy Central Lab.

Preferred Volume

Three 2.7 mL whole blood or four 1.0 mL frozen plasma aliquots

Minimum Volume

Two 2.7 mL whole blood or three 1.0 mL frozen plasma aliquot

Transport

Whole Blood: Ambient (15-25°C) 

Plasma: Frozen (-20°C), aliquots must remain frozen during storage and transport

Rejection Criteria

Whole Blood or Plasma, Refrigerated (2-8°C)

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

Daily, Mon-Friday

Reported

1-3 days

Method

Clotting, Immuno turbidometric

Reference Values

Reference Values

Varies, see report

CPT Codes

85240, 85246, 85610, 85730, 85245

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