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Thrombin Time
Test CodeTT
CPT Codes
85670
Preferred Specimen
4.5 ml of whole blood preferred (tube must be filled to the line)
Minimum Volume
1.8 ml of whole blood preferred (tube must be filled to the line)
Instructions
Collect one full sodium citrate tube (blue top). Send to lab immediately. If the specimen needs to be transported, centrifuge the specimen, aliquot the specimen into a separate container, spin again, aliquot the specimen into a new container and freeze.
Transport Container
One full 4.5 mL Sodium Citrate tube (blue top) refer to instructions for transport.
Transport Temperature
Frozen
Specimen Stability
Specimen must be centrifuged within one hour of collection.
Room Temperature: 4 hours (centrifuged)
Refrigerated: Not acceptable
Frozen: 30 days
Room Temperature: 4 hours (centrifuged)
Refrigerated: Not acceptable
Frozen: 30 days
Methodology
Clotting
Setup Schedule
Daily
Report Available
Inpatient turn around time: Routine 1.5 hours, stat 45 minutes. Outpatient testing received by noon will be reported by 4:30 p.m. Specimens received after noon will be reported by the next morning.
Reference Range
Specimens which are not properly filled do not contain the proper anti-coagulant to blood ratio and are therefore rejected. Hemolyzed and clotted specimens are also unacceptable for testing.
