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Prothrombin Time Mix (PT Mix)

Tube Type = Light Blue Top

Tube Type

Test ID LAB5332
EPIC Order EQUAL MIX PT/INR
CPT Code(s) 85611
Group/Individual Test Individual
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 light blue top tube
Stability
 


 Unspun: 4 hrs
Room Temperature: 4 hrs
Refrigerated: NO
Frozen: 14 days (platelet poor plasma only)
Internal Reference Testing
Specimen Handling Instructions:		                                                                   Platelet Poor; Aliquot and Freeze within 4 hours.
Availability Routine: 24 hr/day
STAT: N/A
Turnaround Time 2 hrs
Reference Range Normal: Interpretation
Comments
  • Deliver Immediately
  • Should be Ordered on Same Sample as PT
  • 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