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Epic Code LAB2111186 von Willebrand Factor Multimer

Important Note

Multimer testing is no longer available in the inpatient setting without pathologist approval. This testing requires results for both von Willebrand activity and von Willebrand antigen prior to being sent out and will only be performed when von Willebrand activity or von Willebrand antigen are below normal. Any other requests for this testing will be cancelled as this testing is not indicated if the vWF antigen or activity are NOT abnormally low. Samples are frozen and stored for up to 2 months. 

Additional Codes

Versiti Wisconsin test code 1063

Test Name Alias

vonWillebrand Multimer Analysis VWF Quantitative Multimer | 8283 | 1230101297

Interface Order Alias

10283

Collection Instructions

Specimen Collection: Blood

Container(s): Blue top (3.2% Na. Citrate)

  • Preferred Volume to Collect: 2.7 mL (full tube)
  • Minimum Volume to Collect: 1.8 mL (full tube)
  • Capillary collect ok: No
  • Microtainer acceptable: No

 

COLLECTION INSTRUCTIONS

  • Detailed instructions (link): Anticoagulant Correction for High Hematocrit

  • Detailed instructions (link): Blue Citrate Tube

  • Tube must be full. Do not over fill or under fill; look for the fill indicator lines.

  • Gently invert 8 - 10 times to mix anticoagulant with blood.
  • Specimen should be processed within 1 hour – See Processing Instructions below.

 

PROCESSING INSTRUCTIONS (Laboratory, Outpatient or Off-site collection)

 

Processed Specimen: Platelet Poor Plasma with a platelet count <10 X 109/L

Centrifuge/Spin: Yes

Aliquot: Yes

Processing Instructions:

  • Centrifuge and remove plasma within 1 hour of collection.
  • Separate plasma into 2-3 aliquots, minimum of 0.5 mL each.
  • Freeze aliquots in plastic transport tubes immediately.

Transport Temperature:

  • Ambient (up to 1 hour in whole blood state)
  • Frozen (plasma only >4 hours)

Rejection Criteria

Hemolysis

Specimen Stability

Ambient: 1 hour

Frozen: 2 months

Test Frequency

Sent to reference laboratory. Usual TAT 7-10 days.

Performing Department

Send Outs

Performing Department Laboratory Location

Send Out to Versiti Wisconsin Ref. Lab

CPT

85247

CDM Code

80101911

Epic Test ID

1230101297

LOINC

vWFMultimer Analysis: 32217-2

vWFMultimer Analysis Interp: 8251-1

Reviewed Date

6/9/2023

Updated Date

7/28/2025 - Important note added

Orderable Regions

Send Outs