| Primary Name |
Thrombin Time |
| Synonym |
Thrombin clotting time |
| Contraction |
TT |
| Contraction |
TCT |
| UAB Procedure Number |
2500171 |
| CPT Code |
85670 |
| Specimen |
Collect one (1) blue-stopper tube (3.2% sodium citrate), filled to specified volume. Do not underfill or overfill.
|
| Specimen Management |
Centrifuge blue-stopper tube within one (1) hour of collection, separate plasma and test or quick-freeze at -70°C. |
| Specimen Accepted |
All times. |
| Test Performed |
All times. |
| Available Stat? |
Yes. |
| Description |
The thrombin time is performed to detect the presence of heparin. If no heparin is present, the thrombin time may be used to detect fibrinogen abnormality. The thrombin time is always used to screen for heparin before performing PT or APTT mixing studies or the lupus anticoagulant profile. |
| Reference Interval |
< 21 seconds |
| Follow-up Test |
Confirm heparin if necessary by treating the specimen with Hepzyme or performing the chromogenic anti-Xa heparin assay. |
| Associated With |
Bleeding disorders |
| Associated With |
Heparin therapy |
| Associated With |
Direct thrombin inhibitor. |
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