Thrombin Time


Sunquest Code:TT  
Epic Code:LAB324Epic Name:Thrombin Time
Synonyms:TT
Methodology:Electromagnetic clot detection
CPT Code:85670
Turnaround Time:Turnaround time is 4 hours if received during lab hours (see Associated Link). With pre-notification, stats are done within 1 hour after receipt in the laboratory.
Associated Links:

Specimen Collection and Processing for Coagulation Specimens



Collection Instructions

Specimen:Blood
Optimal Volume:2.7 mL (in 3 mL tube) - filled to fill line on the tube.
Minimum\Peds Volume:1.8 mL (in 2 mL tube) - filled to fill line on the tube.
Collection Instructions:See link to Specimen Collection and Processing for Coagulation Specimens.
Causes for Rejection:Underfilled tube. Clotted specimen.
Contraindications:Test is not sensitive for monitoring low molecular weight heparin.


Processing and Shipping

Specimen Processing:See link to Specimen Collection and Processing for Coagulation Specimens.
Shipping Instructions:See link to Specimen Collection and Processing for Coagulation Specimens.
Test Performed at or Referral Lab Special Coagulation  (UMMC-East Bank)


Interpretive

Reference Range:13-19 seconds
Limitations:This test is used as a screening test to determine if heparin is present in a sample when performing an inhibitor or mixing study.
Use:Thrombin time uses Human Thrombin, a Stago product containing titrated calcium thrombin approximately 1.5 NIH unit/mL, freeze-dried. This test is sensitive to very low concentrations of heparin.


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