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Ristocetin Cofactor

Centralized Core Laboratory : Hematology

Test ID/Workstation :
RISCO ACOAG
Specimen Type:
Blood
Tube Type:
Blue top (sodium citrate) tube
Collection Volume:
2.7 mL (minimum 1.8 mL) Must use appropriate sodium citrate tube based on volume of blood drawn (1.8 mL or 2.7 mL tube)
Cause for Rejection:
Specimens which have visible hemolysis, are clotted, collected in wrong tube, diluted with IV fluids, contaminated with heparin, tubes that are over or under filled, or specimens received more than one hour post collection.
Storage:
Frozen
Availability:
Daily, 0700-1500
Methodology:
Chromogenic Assay
Special Instructions:
Specimens should be spun down & platelet poor plasma frozen if coming from an off site facility (plasma volume minimum 0.5 mL) If collected at an offsite location, send by a STAT Courier to Hospital lab.
Lab/Phone:
330-543-8418
TAT:
4 hours
Additional Info:
Reference range: 50-150%
CPT Code:
85245
Synonyms:
von Willebrand Factor Activity