PROTEIN S ANTIGEN, FREE

What this test checks

Measures Free Protein S, another natural blood thinner. Low levels increase clotting risk.

Why do people get this test?

Used alongside Protein C in evaluating unexplained clots.

When you should consider this test

• Unexplained clots, especially in young people
• Family history of clotting
• Recurrent miscarriage

How to prepare

No fasting needed. Stop blood thinners only on doctor's advice.