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Thrombin Time

TT Thrombin Clotting Time
Sodium citrate (blue top) seconds

About this test

Time for plasma to clot after addition of thrombin directly. Sensitive to fibrinogen deficiency/dysfunction and heparin contamination. Used in bleeding disorder work-up.

Reference Ranges

Sex Age Range Notes
All ≥ 18 yrs 14 – 19 Adult

Clinical Interpretation

Low / Decreased
Short TT — not routinely interpreted.
High / Increased
Prolonged TT — fibrinogen deficiency or dysfibrinogenaemia, DIC (fibrinogen consumed), direct thrombin inhibitors (dabigatran), heparin contamination (check reptilase time).

Related Tests

Fibrinogen
Specimen
Sodium citrate (blue top)
Reporting Unit
seconds
Category
🩹 Coagulation

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.