Von Willebrand Factor Antigen Test | Austin Pathology

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Von Willebrand Factor Antigen

Alternate Names	VWF Ag
Laboratory	Haematology
Specimen	Blood
Container	Sodium Citrate (Blue top)
Minimum Adult Volume	4mL
Minimum Paediatric Volume	None
Notes	Collect 2 x 4 mL Sodium Citrate (light blue) tubes. Can combine with Factor tests, if also requested.
Frequency	Weekly
Reference Interval	Please refer to reference range provided on report.

These PDF documents can be downloaded for your reference

Order of Draw (PDF)

Swab Collection Guide (PDF)

Pre-Transfusion Specimen Requirements (PDF)

Requirements for Pathology Service (PDF)

Test Code	VWFAG
Container ID	C, CP, CH
Additional (Storage) Instructions	Instructions for: Regional Laboratories Store Platelet Poor Plasma aliquots frozen at -20°C Store Primary Sodium Citrate refrigerated at 4°C
Transport Instructions	Transport frozen
Additional Transport Instruction	Instructions for: Regional Laboratories Transport Platelet Poor Plasma aliquots frozen in biofreeze bottles.
Laboratory Notes	After centrifugation, coagulation specimens remain viable for up to 8 hours at room temperature (RT). Instructions for: Regional Laboratories Please ensure routine coagulation testing is validated prior to double centrifuging for Complex Haemostasis testing. Create a Platelet Poor Plasma aliquot by double centrifuging, aliquoting, and freezing (in line with LWI-HAUT-007). Refer to LWI-HAUT-021 for the number of aliquots required for this test. Instructions for: Heidelberg Specimen Reception Please forward frozen aliquots to the Coagulation Department. Hand directly to a staff member.