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PROTIME-INR
Test CodeLAB320
CPT Codes
85610
Preferred Specimen
3.2% Sodium Citrate light blue tube
Minimum Volume
2.7 mL
Instructions
1.(1) FULL, light blue-top (3.2 citrate) tube. 2. Draw and discard a tube prior to light-blue (citrate) tube.
Transport Container
3.2% Sodium Citrate light blue tube
Transport Temperature
Refrigerated
Methodology
Mechanical Clot Detection
Setup Schedule
Set Up:Daily Report Available:Routine 4 hours/ STAT 1 hour
Reference Range
| INR | Calculated from Prothrombin data | The American College of Chest Physicians / National Heart Lung Blood Institute has recommended MODERATE INTENSITY ANTICOAGULATION REGIMEN (INR 2.0-3.0) for most indications with the exception of patients with MECHANICAL PROSTHETIC HEART VALVES for whom the recommended range is (INR 2.5-3.5) NOTE: The INR is indicated for coumadin therapeutic monitoring only, ideally patients who have been on stable coumadin doses for at least two weeks. Critical value >4.99 | |
| PROTHROMBIN TIME | Mechanical Clot Detection | seconds | 12.3-15.4 Critical value >=46.8 Seconds |
Clinical Significance
The calcium in whole blood is bound by sodium citrate; thus, preventing coagulation. Tissue thromboplastin to which calcium has been added is mixed with the plasma and the clotting time is noted. The prothrombin time (PT) is a screening test for the extrinsic coagulation pathway (factors I, II, V, VII and X). The PT is the most common laboratory assay used to monitor oral anticoagulant therapy. Note: The INR (international normalized ratio) is indicated for coumadin therapeutic monitoring only, ideally for patients who have been on stable coumadin doses for at least two weeks.
Performing Laboratory
GBMC Hematology
