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Test Code PTINR Protime (INR), Blood

Important Note

The Protime (PT/INR) is recommended for the monitoring of Vitamin K antagonists. Direct oral anticoagulant medications (non-Vitamin K) should not be monitored with PT/INR because the effect of this test is not predictable.

Performing Laboratory

North Ottawa Community Hospital

Specimen Requirements

Specimen Type: Whole blood
Container/Tube: Light-blue top (sodium citrate)

Specimen Volume: 3 mL

Collection Instructions: Tube must be completely filled.

Reference Values

PROTIME

10.5-12.5 seconds

 

INR (therapeutic):

2.0-3.0 (moderate)

2.5-3.5 (high)

Critical value (automatic call-back): >4

Day(s) Test Set Up

Monday through Sunday

Methodology

Optical Detection

Specimen Transport Temperature

Ambient

Test Classification and CPT Coding

85610