Antithrombin III Activity

Antithrombin III Activity


The Antithrombin III Activity test measures the functional activity of antithrombin, a protein that helps control blood clotting in the body. Low levels or reduced activity may increase the risk of developing abnormal blood clots, such as deep vein thrombosis (DVT) or pulmonary embolism. This test is commonly used when investigating clotting disorders, recurrent miscarriages, or before starting certain treatments. It provides important information about your body’s natural anticoagulation system.

Parameters Covered

Antithrombin III Activity

What the Test Measures

This test measures how effectively antithrombin is working in your blood to prevent excessive clotting. It helps identify potential clotting disorders and assess your risk of abnormal blood clot formation.

Turnaround Time for Results


Leicester: Most results are available within 1–2 working days (some tests may take longer)
Outside Leicester: Results are typically available within 2–4 working days (some tests may take longer)
Certain parameters: Some specialised tests may take 2–3 weeks to process.

How Results Are Delivered

Your personalised report will be securely sent to your registered email address.