Thrombin Time
Test Mnemonic
TT
CPT Codes
- 85670 - QTY (1)
LOINC ®
3243-3
Performing Laboratory
Cleveland Clinic Laboratories
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 2 mL | Plasma | Sodium citrate (Lt. Blue) | Frozen |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.5 mL |
Days Performed
Mon - Fri
Turnaround Time
4 hours
Methodology
| Name | Description |
|---|---|
| Clotting Assay |
Reference Range
| Thrombin Time | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| Days | 1 Days | Normal | < 17.3 | sec | 2 Days | 5 Days | Normal | < 17.9 | sec | 6 Days | 30 Days | Normal | < 17.9 | sec | 1 Months | 3 Months | Normal | < 18.2 | sec | 4 Months | 11 Months | Normal | < 19.1 | sec | 1 Years | 999 Years | Normal | < 18.6 | sec |
Special Info
3.2% sodium citrate is the preferred anticoagulant recommended by CLSI. Limitations/Contraindications: Uremia or hyperbilirubinemia. Does not include fibrinogen quantitative determination.
Clinical Info
Determination of severe hypofibrinogenemia and heparin-like anticoagulants. Evaluation of heparin or lepirudin effect. Will not detect LMW heparin or danaparoid activity. The thrombin time will be prolonged with dysfibrinogen, paraproteinemia or thrombin inhibitors.