Hemophilia tests

The two primary types of hemophilia are:

• Hemophilia A, known as classic hemophilia, is due to an abnormality in Factor VIII.
• Hemophilia B, or Christmas disease, is due to an abnormality involving Factor IX.

The aPTT is prolonged in hemophilia and is used as a screening test for the disease. The patient with hemophilia has a normal PT and a normal platelet count.

DO NOT MISS this INTERACTIVE site! Select a disorder (such as Hemophilia A or B) from the drop-down list to see its coagulation profile: Screening Laboratory Profiles of Coagulation Disorders (Andy Nguyen, M.D./ UT-Medical School at Houston)

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