Thrombin time
Blood coagulation is a critical process whereby the blood forms clots to stop bleeding. This complex process prevents uncontrolled bleeding and allows wounds to heal.
Under certain circumstances, coagulation may not occur as it's supposed to. Excessive coagulation increases the risk of thrombosis (blood clots), while reduced coagulation increases the risk of bleeding.
| What is the purpose of this test? | This test is used to measure the time it takes for blood to clot. It may be done for several reasons, including the following:
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| How to prepare? | No preparation needed. |
| Reference values* | 12 to 19 seconds |
| Associated tests | Other tests related to blood coagulation may be performed at the same time:
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| How is it done? | A blood sample is drawn, usually from a vein in the arm. |
| How long before I get the results? | Results are usually ready in a day. It may take longer to receive your results. |
What does an abnormal test result mean?
Thrombin time cannot be interpreted on its own. It is important to review the results of other tests typically carried out at the same time to determine the possible cause of abnormal results.
Prolonged thrombin time
A prolonged thrombin time can be caused by the following:
- Certain medications (e.g., heparin, dabigatran [Pradaxa])
- A liver problem (e.g., cirrhosis)
- Disseminated intravascular coagulation (excessive, widespread activation of the coagulation system in blood vessels)
What you should know before going for this test
When you go in for a blood test or any other medical exam, it's always a good idea to bring a complete list of any prescriptions, over-the-counter medications, or natural health products you're taking. Unless otherwise advised, it's best to take your medications as usual on blood test days. If in doubt, don't hesitate to talk to your healthcare professional.
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The patient information leaflets are provided by Vigilance Santé Inc. This content is for information purposes only and does not in any manner whatsoever replace the opinion or advice of your health care professional. Always consult a health care professional before making a decision about your medication or treatment.