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HelpProthrombin Time INR
Additional Codes
LAB320
Performing Laboratory
MBMC Main Laboratory
Methodology
Absorbancy measurement, Clot signature formation
Includes international normalized ratio (INR) and PT.
Literature References:
Package insert: RecombiPlasTin 2G determination of prothrombin time by ACL TOP, Instrumentation Laboratory, June 2012.
Testing Algorithm
If Low Delta mAbs (below 15), then Fibrinogen will be ran at an additional charge
Specimen Requirements
Specimen must arrive within 24 hours; once opened, specimen is stable for 4 hours.
Specimen Type: Plasma
Container/Tube: 2.7-mL, light-blue top (sodium citrate)
Specimen Volume: Full tube
Specimen Minimum Volume: Fill to frosted minimal fill line on the tube.
Pediatric 1.0 mL in special pediatrics collection tube- 3.2% sodium citrate. The tube has no vacuum.
Collection Instructions: It is imperative that the tube be completely filled to maintain the proper ratio of blood to anticoagulant.
Specimen Transport Temperature
Ambient/Refrigerate NO/Frozen NO
Day(s) Test Set Up
Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory
Routine: within 4 hours
Reference Values
PT: 10.2 - 13.5 seconds
INR: 0.90 - 1.20
INR: Critical value (automatic call-back): >5.00
| INR Indication | INR Target |
| Orthopedic | |
| Total Hip and Knee Arthroplasty | 1.8 to 2.6 |
| Hip Fracture | 1.8 to 2.6 |
| Cardiology | |
| Atrial Fibrillation | 2-3 |
| Cardiomyopathy | 2-3 |
| Myocardial Infarction | 2.5-3 |
| Non-native Valves | 2-3.5 |
| Treatment of Venous Thrombosis | |
| Deep Vein Thrombosis | 2-3 |
| Pulmonary Embolism | 2-3 |
Test Classification and CPT Coding
Test Classification:This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer’s instructions.
CPT Code:
85610
85384, if applicable
Stability
24 hours at 18oC to 24oC if the sodium citrate tube is unopened (capped)
4 hours at 18oC to 24oC after the sodium citrate tube has been opened (uncapped)