ARUP's Laboratory Test Directory
| 0030026: Factor VIII Activity with Reflex to Bethesda Quantitative, Factor VIII |
| Test Mnemonic: F8 BETHR | |
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#ExistMethodology>
Methodology: Clotting
*ExistMethodology> #ExistPerformed> Performed: Mon, Wed, Fri (On call 24 hours for emergencies. If Factor VIII is greater than 20%, no further testing will be performed. If Factor VIII Activity is 20% or less, Bethesda Quantitative, Factor VIII will be performed.) *ExistPerformed> #ExistReported> Reported: 1-4 days *ExistReported> |
| Specimen Required: | |
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#ExistCollect>
Collect: Five 5 mL lt. blue (sodium citrate). (Min: Four 5 mL) Refer to the Hemostasis/Thrombosis Specimens section in the front of this User's Guide for specimen collection instructions.
*ExistCollect> #ExistTransport> Transport: Two 4 mL aliquots of platelet-poor plasma, frozen. (Min: 5 mL) Submit specimens in two ARUP Standard Transport Tubes. *ExistTransport> #ExistPedCollectTransport> Pediatric Collection/Transport: 5 mL platelet-poor plasma, frozen. *ExistPedCollectTransport> #ExistRemarks> 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. *ExistRemarks> #ExistConditions> Unacceptable Conditions: Serum. Nonfrozen and hemolyzed specimens. *ExistConditions> #ExistStability> Stability: Ambient: 4 hours; Refrigerated: 4 hours; Frozen: 2 weeks *ExistStability> |
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| Reference Interval: | |||||||||
#ExistRefRangeTable>
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| Note: | |
| If Factor VIII activity is 20% or less, then Bethesda Quantitative, Factor VIII will be added. |
| CPT Code(s): | |
| 85240 Factor VIII; if reflexed, add 85335 Bethesda Quantitative |