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Protime or Prothrombin Time (PT), Plasma
Test CodePTT
Alias/See Also
PT
CPT Codes
85610
Preferred Specimen
Testing should be performed within 24 hours of draw. Draw blood in a blue-top (sodium citrate) tube. Spin specimen down and send 2 mL of plasma in plastic vial. If testing is delayed plasma should be placed in a tightly-sealing tube and may be stored frozen for up to 2 weeks.
Transport Temperature
Frozen
Methodology
Viscosity Based Detection
Setup Schedule
Monday through Sunday
Reference Range
PT: 9.0-12.7 seconds
Critical value: greater than normal range on pre-Op patients not receiving anticoagulant
INR >2.0 on patients not receiving anticoagulant therapy
INR >4.0 on patients receiving anticoagulant therapy
Performed By
North Mississippi Medical Center Pathology Department
Performing Laboratory
NMMC Pathology Department