ARUP's Laboratory Test Directory

Prothrombin Time/International Normalized Ratio : 0030224

Mnemonic: PT INR

Methodology: Electromagnetic Mechanical Clot Detection
Performed: Sun-Sat
Reported: 1-2 days
Specimen Required: Collect:  One 5 mL lt. blue (3.2% sodium citrate).

Transport:  1 mL platelet-poor plasma, frozen. (Min: 0.5 mL) Submit specimen in an ARUP Standard Transport Tube.

Unacceptable Conditions:  Serum.  Nonfrozen, clotted, or hemolyzed specimens.

Stability:  Ambient: 24 hours; Refrigerated: 24 hours; Frozen: 1 week
Reference Interval:



       
 
Test Number Components Reference Interval
 International Normalized Ratio Coumadin Therapy:
  INR: 2.0-3.0 conventional anticoagulation
  INR: 2.5-3.5 intensive anticoagulation
 Prothrombin Time 12.0-15.5 seconds

Note: Reference intervals established using 3.2% sodium citrate.
CPT Code(s): 85610
 
 

 

 

 
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