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0030224
Prothrombin Time/International Normalized Ratio
PT INR
Ordering Recommendation
Initial test for evaluating bleeding disorders and monitoring oral anticoagulation therapy (warfarin/Coumadin).
New York DOH Approval Status
This test is New York state 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
Methodology
Electromagnetic Mechanical Clot Detection
Performed
Sun-Sat
Reported
1-2 days
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
Compliance Category
FDA
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
- Protime
- Protime, PT/INR
- Pro Time
- INR
- PT/International Normalized Ratio
Prothrombin Time/International Normalized Ratio
