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INR (Prothrombin Time)
MessagePerformed in the Hematology Laboratory x5475, 76
Sample MUST be drawn to minimum fill line on tube.
INR is performed with the PT (Protime)
Sample MUST be drawn to minimum fill line on tube.
INR is performed with the PT (Protime)
Test Code
NA (see PT)
Alias/See Also
Performed with the PT. Cannot be ordered as a stand alone test.
CPT Codes
No Code
Preferred Specimen
plasma
Minimum Volume
1.8 and 2.7 mL (2 tube sizes). Sample MUST be drawn to minimum fill line on tube or the sample will be rejected as QNS.
Instructions
To prevent QNS sample draws: If the sodium citrate tube is the only sample to be collected with a butterfly collection device, draw a discard tube first OR collect after drawing other samples.
Transport Container
Light Blue Top (Sodium Citrate), 1.8mL draw or 2.7 mL draw tubes
Transport Temperature
Room Temperature
Specimen Stability
Refrigerator Stability: 12 hours
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Grossly hemolyzed, QNS, clotted
Methodology
Optical Clot detection
Setup Schedule
24/7
Limitations
No interference up to 1 IU/mL of heparin, 500 mg/dL hemoglobin, 1000 mg/dL triglycerides, 30 mg/dL bilirubin.
Results may be affected by many commonly administered drugs. Further studies should be made to determine the source of unexpected abnormal results.
Reference Range
Normal: 0.9-1.3; Therapeutic Range: Varies with clinical indication
Clinical Significance
Monitor Coumadin anticoagulant therapy.
