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International Normalized Ratio (INR)

Tube Type

Test ID LAB320
EPIC Order PROTIME-INR (SEE PROTIME)
CPT Code(s) 85610
Group/Individual Test Part of Prothrombin Time
Laboratory Core Laboratory
Tube Station 30 Routine: 888 STAT
Specimen Routine: 2.7 mL Blood/Lt Blue Sodium Citrate tube; See Comments
Pediatric: 1.8 mL Blood Pediatric Lt Blue Sodium Citrate tube
Stability



 Unspun: 4 hrs
Room Temperature: 24 hrs
Refrigerator: NO
Frozen: 14 days (platelet poor plasma only)
Availability Routine: 24 hr./day
STAT: Yes
Turnaround Time Routine 2 hrs.
STAT 1 hr.
Reference Range Normal: Interpretation - Refer to Prothrombin Time reference ranges.
Comments
  • Prothrombin Time MUST be Ordered
  • Calculation Based on Prothrombin Time.
  • Draw tube must be allowed to fill completely.
  • Short draws will be rejected.

Reviewed by J. Carr on November 20, 2025

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514