ARUP's Laboratory Test Directory
| 0030095: Factor VIII, Activity |
| Test Mnemonic: F8 | |
|
Methodology: Clotting
Performed: Mon-Sat Reported: 1-4 days |
| Specimen Required: | |
|
Collect: One 5 mL lt. blue (sodium citrate). (Min: 3 mL) Refer to the Hemostasis/Thrombosis section in the front of this User's Guide for special 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. For hemophiliacs: note dose, date, and time of last factor VIII concentrate infusion. Unacceptable Conditions: Serum. Nonfrozen or hemolyzed specimens. Stability: Ambient: 4 hours; Refrigerated: 4 hours; Frozen: 2 weeks |
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| Reference Interval: |
|
0-6 years: 56-190% 7-9 years: 78-199% 10-11 years: 83-226% 12-13 years: 74-205% 14-15 years: 69-241% 16-17 years: 63-225% 18 years and older: 56-190% |
| CPT Code(s): | |
| 85240 |