How is it assessed?

• Plasma levels of individual clotting factors can be measured with simple blood tests.
• The haemophilia carrier state can be identified by genetic testing in women and prenatal diagnosis is possible in families who know they have a gene mutation. Knowing a child has haemophilia before birth can prevent birth trauma.
• Inhibitors are screened for regularly.
• The presence of an inhibitor is abnormal.
• The amount of inhibitor is measured in Bethesda units.