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Coagulation Studies

Thrombin Time

Normal range 14-19 seconds. Specimen: Plasma (sodium citrate).

Also known as: TT.

14-19 secondsReference range

Reference range

Conventionalseconds
1419

Combined adult band. LabVals does not publish separate men's, women's, or pediatric ranges for Thrombin Time; those can be narrower than the band shown.

Thrombin Time reference range, specimen, and conversion details
SpecimenPlasma (sodium citrate)
Conventional range14-19 seconds
SI range14-19 seconds
Conversion factor×1 (conventional → SI)
PanelCoagulation Studies

Convert any Thrombin Time result between units on the unit converter.

What is the normal range for Thrombin Time?

The standard teaching reference range for Thrombin Time is 14-19 seconds. This value is measured in plasma (sodium citrate).

Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.

At the bedside

Nursing considerations

  • Prolonged by heparin and by fibrinogen abnormalities.
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