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TCT
THROMBIN CLOTTING TIME, PLASMA

Test Code TCT 
Test THROMBIN CLOTTING TIME, PLASMA 
Methodology Clot-Based 
Description Useful for detecting fibrinogen deficiency/dysfunction in conjunction with fibrinogen assay. This assay is affected by heparin.

NOTE: If TCT result is > 30.0 seconds a reptilase time will automatically be performed at an additional charge. 

Specimen Collect specimen as follows:
1. Draw blood in light blue-top (3.2% sodium citrate) tube(s). Separate plasma from cells within 1 hour of collection in a centrifuge at 2,500 rpm for 15 minutes or 3,000 rpm for 10 minutes.
2. Using a plastic transfer pipette (do not use a glass pipette) decant the plasma to a screw-capped, plastic (polypropylene) vial. (Glass vials will not be accepted.)
3. Divide the specimen into as many 0.5 - 1.0 mL aliquots as possible and cap the vial(s) tightly.
4. Freeze specimen(s) immediately at <= -40 C.
5. Send specimen(s) FROZEN on dry ice.

NOTE:
1. SPECIMENS WILL BE REJECTED IF UNDERFILLED (<90%), CLOTTED, HIGH HEMATOCRIT (>55%), OR GROSSLY HEMOLYZED.
2. Follow "Special Procedure for Drawing Specimen from an A-line". 

Reference Values 11 - 15 seconds 
Analytic Time 1 Day 
Day(s) Test Set Up Monday through Sunday 
CPT Code(s) 85635  Reptilase time (if indicated)
85670  Thrombin clotting time

Special Instructions