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Prothrombin Time/International Normalized Ratio (PTINR)
Ordering Recommendation
Initial test for evaluating bleeding disorders and monitoring oral anticoagulation therapy (warfarin/Coumadin).
Methodology
Electromagnetic Mechanical Clot Detection
Performed
Mon-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 a 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
Components
Available Separately
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
Note
Reference intervals established using 3.2 percent sodium citrate.
CPT Code
85610
Components
Component Test Code
Component Chart Name
LOINC
0030220
Prothrombin Time
5902-2
0030223
International Normalized Ratio
6301-6
Aliases
INR
Pro Time
Protime
Protime, PT/INR
PT/International Normalized Ratio
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