Test Code TT Thrombin Time (TT)
Additional Codes
| PathLab | TT |
| Epic ID | LAB324 |
Specimen Requirements
Preferred Collection Container:
Light Blue (Citrate)
Collection Information:
Collect one full blue top tube
Transport Information:
- Spin down, remove plasma, spin plasma again, and place 1 mL of platelet-poor plasma in plastic vial. (Glass vial is not acceptable.) Note: Double-centrifuged specimens are critical for accurate results as platelet contamination may cause spurious results.
- Freeze specimen immediately at ≤ -40° C, if possible.
- Send specimen frozen.
Note: Each coagulation assay requested should have its own vial.
Minimum Sample Volume:
0.5 mL of plasma
Stability/Transport
| Temperature | Stability | Preferred Transport |
| Refrigerated | Not Acceptable | |
| Frozen | 30 days | X |
| Room Temp | 2 hours |
Unacceptable Conditions
Hemolyzed or lipemic specimens.
Performing Lab
Pathology Laboratory
Methodology
Clot-Based Assay
Day(s) Performed
Daily
CPT Code Information
85670