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Thrombin Time

Justification

Coagulation assay for the assessment of fibrin formation. Thrombin time may be prolonged due to afibrinogenemia, hypofibrinogenemia, dysfibrinogenemia, or the presence of heparin and direct thrombin inhibitors. Heparin contamination can be ruled out by adding protamine sulfate if thrombin time is prolonged.

STAT: < 24 hours (7 days a week)

Clot-based

Draw Tube: Blue Top

Sample Type: Citrated Plasma

Specimen Requirements

Sample Type Volume Required Minimum Volume Stability
PREFERRED Citrated Plasma 1mL 0.5mL Frozen (-20C): 2 weeks
Frozen (-80C): 6 months
ALTERNATIVE - - - -
REJECTION CRITERIA Thawed in transit, refrozen or clotted sample
SPECIAL INSTRUCTIONS -

General Information

METHODOLOGY Clot-based
STAT TAT < 24 hours (7 days a week)
STAT TAT Performance > 90% of results released in 24 hours 7 days a week
ROUTINE TAT < 3 days (M-F)
ALTERNATIVE NAMES Thrombin Clotting Time (TCT), TT
DESCRIPTION Coagulation assay for the assessment of fibrin formation.
LIMITATIONS -
NORMAL RANGE < 21.0 seconds
ASSOCIATED TESTING -
REFERENCES -
SAMPLE REPORT Upon request
NEW YORK STATE APPROVED -

Test Codes

ORDER CODE P3114
CPT CODE 85670
LOINC CODE 3243-3