Test Overview
Test Methodology

Clot determination with human thrombin.

Test Usage

Detection of low or dysfunctional fibrinogen and fibrinolytic degradation products.

Reference Range *

< 21 seconds

Test Details
Days Set Up
Daily (Monday - Friday only)
Analytic Time

1 hour

Soft Order Code
TCTD
MiChart Code
Thrombin Time
Synonyms
  • Thrombin Time, Diagnostic
  • TTD CONT
  • TTD SEC
  • DIGNOSTIC THROMBIN TIME CONT
  • THROMBIN TIME DX, SECONDS
Laboratory
Hematopathology
Section
Coagulation
Specimen Requirements
Collection Instructions

Collect specimen in a blue top (citrate 3.2%) tube. Mix by inversion. Specimen should arrive at lab within 3 hours of collection; transport at room temperature. Alternatively, centrifuge, aliquot plasma into a plastic vial, and freeze the specimen within 4 hours of collection. Transport frozen specimen on dry ice. Collection of the blood through lines that have been previously flushed with heparin should be avoided. If the blood must be drawn through a VAD (vascular access device), the line should be flushed with 5 mL of saline and the first 5 mL of blood or six dead space volumes of the VAD discarded.

Rejection Criteria
Specimens will be rejected if not properly filled, clotted, grossly hemolyzed, or contaminated with heparin.
Contraindications
Test is not indicated for patients on heparin therapy.
Blue Top Tube
Normal Volume
Full 2.7mL tube or 1mL plasma aliquot
Minimum Volume
Full 1.8mL tube or 1mL plasma aliquot
Storage Temperature
Room temperature for whole blood or frozen aliquot of citrated plasma
Billing
CPT Code
85670
Fee Code
31111
NY State Approved
No