ANTITHROMBIN III ACTIVITY, FUNCTIONAL

What this test checks

Measures Antithrombin III activity, a natural blood thinner. Low levels increase clot risk.

Why do people get this test?

Standard part of inherited clotting disorder work-up.

When you should consider this test

• Unexplained blood clots
• Family history of clotting
• Recurrent miscarriage work-up

How to prepare

No fasting needed.