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Prothrombin Time with INR
MessagePerformed in the Hematology Laboratory x5475,76. Sample MUST be drawn to minimum fill line on tube.
Test Code
PT
Alias/See Also
Protime
CPT Codes
85610
Includes
INR (International Normalized Ratio)
Preferred Specimen
plasma
Minimum Volume
2.7 mL. 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), 1.8 or 2.7 mL draw
Transport Temperature
Room Temperature
Specimen Stability
Stable refrigerated: 12 hours
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Grossly hemolyzed, QNS, Clotted
Methodology
Optical clot detection
Setup Schedule
24/7
Reference Range
PT Normal: 9.7-14.0 seconds
INR Normal: 0.9-1.3; Therapeutic Range: Varies with clinical indication
INR Normal: 0.9-1.3; Therapeutic Range: Varies with clinical indication
Clinical Significance
Monitor Coumadin anticoagulant therapy. Detection of factor deficiencies (congenital, acquired).
