Prothrombin Time (PT)

Tube Type = Light Blue Top

Tube Type

Test ID LAB320
EPIC Order PROTIME-INR
CPT Code(s) 85610
Group/Individual Test Group
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/Lt Blue Sodium Citrate tube
Stability Unspun: 4 hours
Room Temperature: 24 hours
Refrigerated: NO
Frozen: 14 days (plasma only)
Availability Routine: 24 hr/day
STAT: YES
Turnaround Time Stat: 1 hour; Routine: 2 hours
Reference Range Age <6mos: Not defined
Age >6 mos: 9.9-12.6 (Corresponding INR: 0.9-1.1)
Critical Value: >55 secs
Comments
  • Deliver Immediately
  • Reference Range changes with reagent lot number.
  • 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