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Thrombin Time
Abbreviation: TT
Panel: Blood Clotting (Coagulation) · All clotting tests
Typical adult reference range
| Conventional units | 14–21 sec |
| SI units | 14–21 sec |
Ranges vary between laboratories and methods — compare your result with the range printed on your own report.
What a high or low result can mean
High thrombin time: prolonged values can be seen with heparin exposure, low or abnormal fibrinogen, and some direct thrombin inhibitors.
These are associations, not a diagnosis: the same result can have several causes, and your clinician interprets it with the rest of your results and history.
Related tests — Blood Clotting (Coagulation)
Please note: Reference ranges vary between laboratories, and between the methods and instruments they use — the range printed on your own report is the one your result should be compared with. A result outside the range is not by itself a diagnosis, and a result inside it does not rule out illness. These pages are an educational summary, not medical advice: always discuss your results with the clinician who ordered them, who can interpret them in the context of your health and history.