Quick Reference
- Full form
- International Normalized Ratio
- Sample type
- Blood
- Fasting
- Not required
- Marker measured
- 1
- Report turnaround
- Same day
- Available at
- All locations
About INR
INR standardises clotting time results, making them comparable across different labs, and is most commonly used to monitor patients on blood thinning medication like warfarin, ensuring their dose keeps them in a safe range.
No fasting is required, and results are available the same day.
How to Prepare
- No fasting required.
- Tell your doctor about any blood-thinning medication before this test.
Frequently Asked Questions
What is INR testing used for?
It is mainly used to monitor patients on blood thinning medication like warfarin, keeping their dose in a safe range.
Do I need to fast before this test?
No fasting is required.
How often do patients on warfarin need INR checks?
This varies by patient, but many need regular monitoring, sometimes monthly or more frequently, as advised by their doctor.
Why is INR preferred over a basic clotting test for monitoring?
INR standardises results across labs and methods, making it more reliable for tracking medication effects over time.
How soon will my report be ready?
Same day.
Is home sample collection available?
Yes, which is especially convenient for patients needing regular INR monitoring, in all City Care Lab service areas.
This page provides general health information and is not a substitute for medical advice. Speak with your doctor about your specific results and treatment.