PROTHROMBIN TIME MIXING STUDY

Synonyms: PT Mixing Study
Computer Code: (MPT)
Specimen Collection: Three 2.7 mL (blue top tubes) 90% full. Transport to lab within 3 hours.
Minimum Volume: two 2.7 mL (blue top tubes) 90% full. Transport to lab within 3 hours.
Handling Instructions for Offsite Areas: Maintain at room temperature. If specimen cannot be transported within 2 hours, centrifuge at 3,000 rpm for 20 minutes. Using a plastic pipette, transfer plasma to plastic tube and freeze plasma.
Reference Values: Test to differentiate whether an abnormal PT is due to a factor deficiency or an inhibitor.
Lab Code: Hematology
Requisition: C/H
Test Frequency: Daily
Routine TAT: NA
Stat TAT: contact lab
CPT Code(s): 85610x2, 85611
LCD or NCD:
Methodology Used:
See Addendum XVII