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PT-INR
Test CodeLAB320 1230100228
Alias/See Also
LAB320
PT PTI
PT PTI
CPT Codes
85610
Includes
PROTHROMBIN TIME (PT) IN PPP BY COAGULATION ASSAY
INR IN PPP BY COAGULATION ASSAY
INR IN PPP BY COAGULATION ASSAY
Preferred Specimen
Plasma
Instructions
Completely fill the Blue Top (sodium citrate) tube. Underfilled tubes will not be accepted. Mix sample immediately by gentle inversion at least six times.
Transport Container
LT BLUE TOP-CITRATE
Transport Temperature
Refrigerated
Specimen Stability
If transport time will exceed 24 hrs, send platelet-poor plasma 2 to -20C or less.
To obtain platelet-poor plasma: centrifuge, separate plasma, recentrifuge, and separate plasma into a transport tube.
To obtain platelet-poor plasma: centrifuge, separate plasma, recentrifuge, and separate plasma into a transport tube.
Reference Range
| External Name | Result Checking Type | Low (N) | High (N) | Numeric Range (N) |
| PT | Reference Range | 9.5 | 11.5 | 9.5-11.5 |
| INR | Reference Range | 4.5 | <4.5 | |
| INR | Abnormality - Critical | 4.5 | >=4.5 | |
| INR | Display Reference Range | See comment: |
The suggested therapeutic INR range for patients receiving coumadin varies in certain conditions. In general, an INR of 2-3 is recommended. A range of 2.5-3.5 is recommended for mechanical heart valve patients and in the presence of a lupus anticoagulant (per chest guidelines).
Performing Laboratory
MWH LAB SH LAB LH FSED MAIN LAB HC FSED Main Lab
