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Von Willebrand Factor Activity, Plasma

Test ID: VWFACT
Test
Specimen
Performance / Interpretation
Interface / Setup

Test

Method

Immunoturbidimetry

Report Includes

Von Willebrand Factor Activity

Specimens

Plasma (Citrate)

Test Location

St. Michael's Hospital, 30 Bond Street, Toronto ON M5B 1W8

Test Version

1-Mar-2023

Specimen

Specimens

Plasma (Citrate)

Sample Volume

1 mL

Collection & Handling

Handling Information

Separate and freeze immediately. Store and send frozen.

Stability

If the specimen thaws, it is unsuitable for analysis.

Rejection Criteria

Specimen Not frozen

Test Version

1-Mar-2023

Performance / Interpretation

Method

Immunoturbidimetry

Turnaround Time

10 days

Results

Name Units Reference Range Conversion Factor
Von Willebrand Factor Activity U/mL
  • Blood Group O: 0.48 - 1.24
  • Other Blood Groups: 0.67 - 1.70
  • Limitations:
  • 1. The presence of rheumatoid factor may produce an over-estimation of thetest result.
  • 2. Some cases of type 2 Von Willebrand disease may give normal results with this activity assay.

Test Location

St. Michael's Hospital, 30 Bond Street, Toronto ON M5B 1W8

Test Version

1-Mar-2023

Interface / Setup

Test Version

1-Mar-2023