Test directory: Thrombin Time

Ordering Code517
Test NameThrombin Time
AliasThrombin Clotting Time
TT
TCT
Preferred SpecimenPlasma
Preferred ContainerCitrate, 3.2% (Lt Blue)
Other Specimen/ContainerWhole Blood in Citrate, 3.2% (Lt Blue) if testing is done within 4 hours.
Optimum VolumePlasma: 1 mL
Whole Blood: Entire tube
Collection InstructionsDraw full tube
Mix tube well
Handling InstructionsDouble centrifuge plasma, separate, and freeze at -20 deg. C immediately. Do NOT thaw once specimen is frozen.
Transport RequirementsPreferred method of transport is frozen plasma.
Specimen StabilityAmbient: 4 hours Whole Blood (unopened tube)
Ambient: 4 hours Plasma
Frozen: 2 weeks Plasma
Rejection CriteriaClotted, Contaminated, Hemolyzed,
Improperly filled or underfilled tube,
Specimen older than stability limits.
Avail. StatYES
Analytic Time1 Day
MethodologyClot Detection

Reference range(s)

ComponentAgeMale NormMale Critical LowMale Critical HighFemale NormFemale Critical HighFemale Critical LowUnitsAdd'l info
Thrombin TimeALL15-2215-22secs