INR
- Test Name:
- INR
- Synonyms:
-
International normalized ratio
Prothrombin time
- Collection Device/Tube Type:
-
2.7 mL blood - plastic, blue top tube (citrate)
CGY DSC: Pediatric/Neonate: 2.7 mL or 1.8 mL blood - plastic, blue top (citrate)
- Collection Instructions:
-
• Fill collection tube completely
• Immediately mix tube 3-4 times by gentle inversion
- Submission Requirements:
-
Sample is stable at room temperature for 24 hours
• Do not place tubes on ice
Sample must be received and tested within 24 hours of collection
If a delay of >24 hours is expected:
• Centrifuge and separate platelet poor plasma
• Use plastic tubes and pipettes
• Submit frozen platelet poor plasma in a polypropylene aliquot tube, and not a clear plastic polystyrene tube
- Frequency of Testing:
-
Daily
- Reference Range:
- 0.8 - 1.2
- Critical Values:
- Hematology and Coagulation Critical Values
- Last Reviewed:
- 09 May 2023
