ARUP's Laboratory Test Directory
| 0030250: von Willebrand Factor Activity (Ristocetin Cofactor) |
| Test Mnemonic: RCF | |
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Methodology: Platelet Agglutination
Performed: Mon, Wed, Fri Reported: 1-4 days |
| Specimen Required: | |
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Collect: One 5 mL lt. blue (sodium citrate). Refer to the Hemostasis/Thrombosis Specimens section in the front of this User's Guide for specimen collection instructions.
Transport: 2 mL platelet-poor plasma, frozen. (Min: 1 mL) Submit specimen in an ARUP Standard Transport Tube. Pediatric Collection/Transport: 1 mL platelet-poor plasma, frozen. Remarks: CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered. Unacceptable Conditions: Serum. Nonfrozen or hemolyzed specimens. Stability: Ambient: 4 hours; Refrigerated: 8 hours; Frozen: 2 weeks |
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| Reference Interval: |
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0-6 years: 44-195 % 7-9 years: 51-172% 10-11 years: 61-195% 12-13 years: 47-183% 14-15 years: 50-215 % 16-17 years: 47-206% 18 years and older: 44-195% |
| CPT Code(s): | |
| 85245 |