Quick Reference
- Full form
- Prothrombin Time (INR)
- Sample type
- Blood
- Fasting
- Not required
- Marker measured
- 1
- Report turnaround
- Same day
- Available at
- All locations
About Prothrombin Time (INR)
Prothrombin Time with INR checks how long it takes your blood to clot through a different pathway than APTT, and is the standard test for monitoring patients on warfarin therapy.
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 Prothrombin Time (INR) used for?
It is the standard test for monitoring patients on warfarin therapy, along with general clotting assessment.
Do I need to fast before this test?
No fasting is required.
How often should warfarin patients get this test?
This varies by patient, but regular monitoring, sometimes monthly, is common as advised by your doctor.
Is this the same as a basic clotting time test?
It is a more standardised measure specifically used for accurate cross-lab comparison, especially important for medication monitoring.
How soon will my report be ready?
Same day.
Is home sample collection available?
Yes, especially convenient for regular 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.