Learn about the specialty screening tests and evaluations required to diagnose hemophilia B.
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Hemophilia B diagnosis includes tests that evaluate if the blood is clotting properly, the clotting time, the type of hemophilia, and the severity.1,2
If hemophilia B is suspected, blood tests are often used to measure how long blood clots take to form. However, a specific factor IX activity test must be performed to confirm the diagnosis of hemophilia B or another clotting factor deficiency, since mild cases may not be detected otherwise.1,2
Many families with a history of hemophilia have their baby boys tested shortly after birth.2
When my first boy was diagnosed, there was shock and disbelief.
–Jane, parent
Once the diagnosis of hemophilia B is made, genetic testing can help predict a patient’s risk of developing inhibitors to factor treatment. Analysis of the specific gene mutation can also help identify female carriers of hemophilia B within a family. Genetic information like this can also help in the prior-to-birth diagnosis of hemophilia B in other carrier pregnancies.3
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