Prothrombin Time
Methodology
STAGO Compact Max Electromagnetic Mechanical Clot Detection
Performing Laboratory
Heart of the Rockies Regional Medical Center
Specimen Requirements
Specimen Type: Plasma, citrated
Container/Tube: Light-blue top
Specimen Volume: Full tube
Additional information: Plasma may be held at room temperature (20 5 °C) for a maximum of eight hours or separated, double-spun, and frozen at -20 to -80 °C in a plastic tube. Do not store plasma at 2-8 °C because in this temperature range, Factor VII may be activated by the kallikrein system. Frozen plasma may be stored for two weeks at -30 °C. F
Specimen Transport Temperature
Ambient ≤8 hours or Frozen for two weeks
Reference Values
11.6-15.2 seconds (non anticoagluated)
22.7-35.4 seconds (Therapeutic or anticoagulated)
Critical values:
INR: >5.0
Day(s) Test Set Up
All
Test Classification and CPT Coding
85610