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Factor IX Deficiency - Hemophilia B
- Overview, Causes, & Risk Factors
- Symptoms & Signs
- Diagnosis & Tests
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- Treatment & Monitoring
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Diagnosis & Tests
How is the disease diagnosed?
Hemophilia B is diagnosed by measuring factor IX protein activity in the plasma. The severity of the disorder is closely linked to factor IX activity. An individual with mild disease has more factor IX activity than those with severe disease. Other tests that may be used in diagnosis include the partial thromboplastin time, or PTT, and thrombin time, or PT. These lab tests measure the clotting ability of the blood.