Thrombin Time




Test Mnemonic

TT

CPT Codes

  • 85670 - QTY (1)

LOINC ®

3243-3

Performing Laboratory

n/a


Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
2 mLPlasmaSodium 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
   Days1 DaysNormal< 17.3sec
 2 Days5 DaysNormal< 17.9sec
 6 Days30 DaysNormal< 17.9sec
 1 Months3 MonthsNormal< 18.2sec
 4 Months11 MonthsNormal< 19.1sec
 1 Years999 YearsNormal< 18.6sec

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.

Clinical Limitation

n/a

Clinical Reference

n/a