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Test Code VWFM2 von Willebrand Factor Multimer Analysis, Plasma

Additional Codes

MLAB: YVWFM

PowerChart: Factor VIII von Willebrand Factor Multimeric

Epic: LAB1111 Von Willebrand Multimeric

MA Cerner: von Willebrand Factor Multimer Analysis.

Reporting Name

von Willebrand Factor Multimer, P

Useful For

Subtyping of von Willebrand factor (VWF):

-When results of complementary laboratory tests (eg, F8A / Coagulation Factor VIII Activity Assay, Plasma; VWFX / von Willebrand Activity, Plasma; and VWAG / von Willebrand Factor Antigen, Plasma) are abnormally low or discordant.

-Primarily used to identify variants of type 2 VWF.

-An aid in determining appropriate treatment

Performing Laboratory

Mayo Medical Laboratories in Rochester

Specimen Type

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 VWPR / von Willebrand Profile.



Additional Testing Requirements


VWFX / 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.



Shipping Instructions


Send specimens in the same shipping container.

Specimen Required


See Coagulation Studies in Special Instructions.

 

Patient Preparation: Specimen should be drawn prior to coagulation factor replacement therapy.

Specimen Type: Platelet-poor plasma

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

Submission Container/Tube: Plastic vials

Specimen Volume: 1 mL in 2 plastic vials each containing 0.5 mL

Collection Instructions:

1. Spin down, remove plasma, and spin plasma again.

2. Freeze specimens immediately at ≤-40 degrees C, if possible.

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.


Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
Plasma Na Cit Frozen 42 days

Reference Values

An interpretive report will be provided.

Day(s) and Time(s) Performed

Monday, Tuesday, Wednesday; 9 a.m.-4 p.m.

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information

85247

LOINC Code Information

Test ID Test Order Name Order LOINC Value
VWFM2 von Willebrand Factor Multimer, P 32217-2

 

Result ID Test Result Name Result LOINC Value
8844 von Willebrand Factor Multimer, P 32217-2

Reject Due To

Hemolysis

Mild OK; Gross reject

Lipemia

Mild OK; Gross reject

Icterus

Mild OK; Gross reject

Other

NA

 

Method Name

Agarose Gel Electrophoresis/Infrared Dye-Labeled Antibody Detection

Forms

1. Coagulation Patient Information (T675) in Special Instructions

2. If not ordering electronically, complete, print, and send a Coagulation Test Request Form (T753) with the specimen (http://www.mayomedicallaboratories.com/it-mmfiles/coagulation-test-request-form.pdf)