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Thrombin Time

Source Blood
Mnemonic TTR
Specimen Requirements Adult:
1 x 2.7 mL blue top sodium citrate plastic tube is preferred. 4.5 mL blue top sodium citrate glass tube is also acceptable.

Pediatric:
1 x 2.7 mL or 1.8 mL short-draw blue top sodium citrate tube

Whole blood. VENOUS COLLECTION ONLY. Skin puncture (capillary) collection is not acceptable.

It is important to fill tube to maximum draw. Mix well.

Indicate collection time on tube.

When using a winged blood collection set (butterfly needle) a discard tube must be used to remove the air in the tubing, if only a citrate tube is drawn or is the first tube drawn.
Specimen Handling DO NOT centrifuge (except PLC, RGH and SHC). Keep at room temperature.
Must be tested within 4 hours of collection.
Additional Information
Testing Location Hematology-FMC, PLC, RGH, SHC
Testing Frequency Daily
Alternate Name(s) TT
Reference Interval 10.3 - 16.6 seconds