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Test Name

Factor VIII Activity, Clotting

CPT Code(s)

85240

Methodology

Clot Detection

Limitations

Expected impact by therapeutic levels (potential interference depends upon drug concentration): Warfarin: no effect; Heparin (UFH or LMWH): no effect to inhibitor pattern; Dabigatran or Argatroban (Thrombin Inhibitors): no effect to inhibitor pattern; Rivaroxaban or Apixaban (Factor Xa Inhibitors): no effect to inhibitor pattern.

Reference Range(s)

50-180 % normal

Clinical Significance

This test is useful to evaluate a prolonged aPTT. The most common form of hemophilia is caused by a deficiency of Factor VIII. Hemophilia A is an X-linked disorder affecting between 1 in 5000 to 10000 males.

Alternative Name(s)

Hemophilia A,Procoagulant Factor 8,Hemophiliac Factor,Antihemophilic Factor,Factor VIII Functional

To view specimen requirements and codes please Select a regional laboratory.

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Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.

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32094P
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8353
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32094P
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Factor VIII Activity, Clotting
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