Ordering Recommendation

Initial test for evaluating bleeding disorders and monitoring oral anticoagulation therapy (warfarin/Coumadin).

Mnemonic
PT INR
Methodology

Electromagnetic Mechanical Clot Detection

Performed

Sun-Sat

Reported

1-2 days

New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
Collect

Lt. blue (sodium citrate)

Specimen Preparation

Transfer 1 mL platelet-poor plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)

Storage/Transport Temperature

CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.

Unacceptable Conditions

Serum. EDTA plasma, clotted or hemolyzed specimens.

Remarks
Stability

Ambient: 24 hours; Refrigerated: Unacceptable; Frozen: 2 weeks

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

Interpretive Data



No compliance statements are in use for this test.

Note

Reference intervals established using 3.2 percent sodium citrate.

Hotline History
N/A
CPT Codes

85610

Components
Component Test Code* Component Chart Name LOINC
0030220 Prothrombin Time 5902-2
0030223 International Normalized Ratio 6301-6
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • INR
  • Pro Time
  • Protime
  • Protime, PT/INR
  • PT/International Normalized Ratio
Prothrombin Time/International Normalized Ratio