Test ID: PTT
CPT code: 85730
LOINC: 14979-9
Specimen Type: Citrate
Frequency: Setup: Daily; TAT <24 hrs
Instructions: Full 3.2% NA citrate tube (Blue). Centrifuge within 1 hr of collection. If not analyzed within 4 hrs, separate plasma and freeze at-20C.
Text: Evaluate intrinsic coagulation system; monitor heparin therapy. Stable 2 weeks frozen.
Methodology: Photometric clot detection