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PTTCA
PTT, CIRCULATING ANTICOAGULANT, PLASMA

Test Code PTTCA 
Test PTT, CIRCULATING ANTICOAGULANT, PLASMA 
Methodology Mixing studies with normal plasma 
Description Useful in the assessment of an unexplained prolonged PTT.

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. Obtain a platelet count on the platelet-poor plasma. If the platelet count is > 10,000, respin the specimen and repeat steps 2 and 3 until the platelet count is < 10,000.
4. Divide the specimen into as many 0.5 - 1.0 mL aliquots as possible and cap the vial(s) tightly.
5. Freeze specimen(s) immediately at <= -40 C.
6. 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 Specimens from an A-Line." 

Reference Values An interpretive report will be issued. 
Analytic Time 1 Day 
Day(s) Test Set Up Available upon request Monday through Friday 8 a.m. - 3 p.m. 
CPT Code(s) 85732  

Special Instructions