International Normalized Ratio (INR)

Test ID LAB320
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/Light Blue Top Tube; See Important Comments
Pediatric: 1.8 mL Blood Pediatric Light Blue Top Tube
Unspun: 4 hours
Room temperature: 24 hours
Refrigerator: NO
Frozen: 14 days (platelet poor plasma only)
Availability Routine: 24 hr./day
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 Christopher Parker on November 16, 2021

Note: Reference ranges provided on this web site are for guidance only, and may not reflect the most recent changes. Refer to laboratory reports for current reference data.

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