Von Willebrand Factor Assay (FVIIIR:RCF)
Label Mnemonic: VWFA
Epic Lab Code: LAB1171
Downtime Form: A-1a Miscellaneous Request
Hemostasis/Thrombosis
6240 RCP
356-3573
Specimen(s):
Collection Medium:
Light Blue top tube 2.7 mL (Na Citrate)
Minimum:
Full draw; 2.7 mL light blue top (mix well). Measured as ristocetin cofactor activity in agglutination of fixed washed platelets.
Rejection Criteria:
Short drawn tube, clot, traumatic tap (excessive hemolysis).
Testing Schedule:
0800-1630 Monday through Friday. For additional services, contact Clinical Pathology Resident on-call at pager #3404.
Reference Range:
49-150%
Comments:
This test needs a separate tube! It CANNOT be done with any other coagulation tests.
Methodology:
A coagulation instrument measures the change in absorbance.
CPT Code:
85245