PROTEIN C, FUNCTIONAL

What this test checks

Measures the activity of Protein C, a natural blood thinner. Low levels increase clot risk.

Why do people get this test?

Used in evaluating unexplained blood clots, especially in young people.

When you should consider this test

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

How to prepare

No fasting needed. Stop blood thinners only if your doctor advises.