Prothrombin Time (PT INR) 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 2 days
- Fasting
- No Fasting
- Age
- 5+ Years
What Is This Test?
Prothrombin Time measures how long your blood plasma takes to clot; the result is also reported as INR, a standardised value.
Why this test is performed?
Monitors blood thinners such as warfarin/acenocoumarol (target INR is often 2–3), checks liver function and assesses bleeding risk before surgery.
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.
What's included 3 parameters
Prothrombin Time (PT INR) (3)
- Control (MNPT)
- Prothrombin Time
- PT (INR) Value
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
Follow your doctor's instructions — usually you take it as usual and tell the lab the time of your last dose.
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 11–35 hours after the sample reaches the lab. You will receive the report online.
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