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Test Code TT Thrombin Time

Important Note

Draw 1 tube- Must be completely filled.

If transport to the lab will exceed 4 hours: Immediately centrifuge the specimen and aliquot 2 mL of plasma into a separate plastic vial. SPECIMEN CANNOT BE FROZEN.

Performing Laboratory

Memorial Hospital - Automated Procedures Laboratory   304-388-5953

Specimen Requirements

Plasma- Light Blue Top, Sodium Citrate

Draw 1 full, tube by “clean” venipuncture (no excessive trauma).

Immediately after draw, invert tubes several times to mix blood with additive.

Specimen Rejection

  • Improperly labeled, collected, transported and stored
  • Hemolyzed specimens
  • Marked lipemia
  • Clotted specimens

Storage and Stability

Room temperature 18-24oC 4 hours

DO NOT freeze sample

Reference Values

11.0-17.8 seconds

Critical Value: > 40 seconds

Methodology

Optical density

Days Test Set Up and Turnaround

Monday through Sunday, Continuously

AM Collection Expected by 9AM same day
Routine Expected within 24 hrs
Stat Expected within 1 hr
Timed Expected results are test dependant

CPT Coding

85670