Protein S Antigen- Free Test

Protein S Antigen- Free Test

Category
Blood Clotting
Sample
Blood sample taken from a vein in your arm
Reports () Terms & Conditions Report time varies with time of sample collection.
In 3 days
Fasting
No Fasting
Age
5+ Years

What Is This Test?

Measures a natural anticoagulant protein (protein C/S) in your blood. Protein C and S are natural blood thinners that prevent excessive clotting.

Why this test is performed?

Deficiency increases the risk of blood clots; tested in unexplained or recurrent clots, often in young people or during pregnancy.

Who should take this test?

Easy bruising or bleeding, heavy periods, blood clots, before surgery, or people taking blood thinners.

Test Preparation

No fasting needed.

Medical disclaimer · for information only, not medical advice

This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.

In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.

Read our Editorial Policy and Medical Review Process.

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Frequently asked questions

No fasting is needed. You can eat and drink normally unless your doctor has advised otherwise.

Blood sample taken from a vein in your arm.

Usually within 31–55 hours after the sample reaches the lab. You will receive the report online.

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