TEST CATALOG ORDERING & RESULTS SPECIMEN HANDLING CUSTOMER SERVICE EDUCATION & INSIGHTS
Test Catalog

Test ID: VWFMS    
von Willebrand Factor Multimer Analysis, Plasma

Specimen Type Describes the specimen type validated for testing

Plasma Na Cit

Advisory Information

Coagulation testing is highly complex, often requiring the performance of multiple assays and correlation with clinical information. For that reason, we suggest ordering AVWPR / von Willebrand Disease Profile, Plasma.

Additional Testing Requirements

VWACT / von Willebrand Factor Activity, Plasma and VWAG / von Willebrand Factor Antigen, Plasma are requested but not required before performing this test. If already assayed, submit results. If no results are included, submit separate specimens for the above assays following specimen requirements for each test.

Specimen Required Defines the optimal specimen required to perform the test and the preferred volume to complete testing

See Coagulation Guidelines for Specimen Handling and Processing in Special Instructions.

 

Patient Preparation:

1. Fasting is preferred.

2. Specimen should be drawn prior to coagulation factor replacement therapy.

Collection Container/Tube: Light-blue top (citrate)

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions:

1. Centrifuge, transfer all plasma into a plastic vial, and centrifuge plasma again.

2. Aliquot plasma into a plastic vial leaving 0.25 mL in the bottom of centrifuged vial.

3. Freeze plasma immediately (no longer than 4 hours after collection) at -20 degrees C or, ideally, < or =-40 degrees C.

Additional Information:

1. Double-centrifuged specimen is critical for accurate results as platelet contamination may cause spurious results.

2. Each coagulation assay requested should have its own vial.

Special Instructions Library of PDFs including pertinent information and forms related to the test

Forms

1. Coagulation Patient Information (T675) in Special Instructions.

2. If not ordering electronically, complete, print, and send a Coagulation Test Request (T753) with the specimen.

Specimen Minimum Volume Defines the amount of sample necessary to provide a clinically relevant result as determined by the Testing Laboratory

0.5 mL

Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected

Gross hemolysis Reject
Gross lipemia Reject
Gross icterus Reject

Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the performing laboratory, alternate acceptable temperatures are also included

Specimen TypeTemperatureTimeSpecial Container
Plasma Na CitFrozen42 days