Also known as: PT INR, Prothrombin time, Blood clotting time test
Blood
Within 2 hours
Home pickup
No fasting needed
Prothrombin Time (PT) with INR measures how long your blood takes to clot via one of the main clotting pathways. It is the standard test for monitoring warfarin (blood-thinner) therapy and for assessing liver function and bleeding risk.
Clinical use cases
Why doctors order it
Patients on warfarin (Coumadin)
Pre-surgery clotting clearance
Liver disease workup
Bleeding-tendency investigation
DVT or pulmonary embolism workup
Over- or under-anticoagulation
Liver dysfunction
Vitamin K deficiency
Clotting disorders
About this test
Prothrombin Time (PT) with INR measures how long your blood takes to clot via one of the main clotting pathways. It is the standard test for monitoring warfarin (blood-thinner) therapy and for assessing liver function and bleeding risk.
Clinical significance
INR standardises the PT result so it is comparable across labs. People on warfarin have a target INR range (often 2–3); too low risks clots, too high risks bleeding. A raised PT/INR in someone not on blood thinners can indicate liver disease or vitamin K deficiency.
Get tested if you have these symptoms
On warfarin or other blood thinners
Easy bruising or prolonged bleeding
Known liver disease
Before surgery or a procedure
What this test detects
Over- or under-anticoagulation
Liver dysfunction
Vitamin K deficiency
Clotting disorders
Normal ranges
PT: 11–13.5 seconds
INR (not on blood thinners): 0.8–1.1
INR target on warfarin: usually 2.0–3.0
Reference ranges vary by lab and patient demographic. Interpret with a clinician.
Sample & preparation
Sample type
Citrate Plasma
Fasting
Not required
Report TAT
Within 2 hours
Home collection
Available
How to prepare
1No fasting required
2Take warfarin at your usual time
3Bring your warfarin dose card or recent INR log
4Citrate plasma collection — special tube
5Avoid grapefruit and vitamin K-rich foods (kale, spinach) the day before if recently restarted
6Download report from dashboard
Frequently asked questions
What is the Prothrombin Time / INR?
Prothrombin Time (PT) with INR measures how long your blood takes to clot via one of the main clotting pathways. It is the standard test for monitoring warfarin (blood-thinner) therapy and for assessing liver function and bleeding risk.
What conditions does the Prothrombin Time / INR detect?
The Prothrombin Time / INR helps detect and monitor conditions including Over- or under-anticoagulation, Liver dysfunction, Vitamin K deficiency, Clotting disorders.
How should I prepare for the Prothrombin Time / INR?
No fasting required|Take warfarin at your usual time|Bring your warfarin dose card or recent INR log|Citrate plasma collection — special tube|Avoid grapefruit and vitamin K-rich foods (kale, spinach) the day before if recently restarted|Download report from dashboard
What is the normal range for the Prothrombin Time / INR?
PT: 11–13.5 seconds
INR (not on blood thinners): 0.8–1.1
INR target on warfarin: usually 2.0–3.0 Note: reference ranges may vary by laboratory and should be interpreted by your doctor in the context of your overall health.
How much does the Prothrombin Time / INR cost?
The Prothrombin Time / INR is available at ₹249 (MRP ₹1119) on PingMeDoc with free home sample collection. Prices are inclusive of sample collection charges.
What INR range should I aim for on warfarin?
For most conditions the target INR is 2.0–3.0, but your doctor sets your exact range. A value below target raises clot risk and above target raises bleeding risk, so regular monitoring is important.
Does the Prothrombin Time / INR test require fasting?
No fasting is required for the Prothrombin Time / INR test. You can eat and drink normally before sample collection.
How much does the Prothrombin Time / INR test cost at PingMeDoc?
The Prothrombin Time / INR test costs ₹249 at PingMeDoc (MRP ₹1119). Free home sample collection is included. NABL-accredited lab processing. Reports delivered digitally in within 2 hours.
How long does it take to get Prothrombin Time / INR test results?
Prothrombin Time / INR test results are typically available within within 2 hours after sample collection. You can view and download your digital report from your PingMeDoc dashboard.
What type of sample is needed for the Prothrombin Time / INR test?
The Prothrombin Time / INR test requires citrate plasma. A trained phlebotomist will collect the sample at your home at your preferred time slot.
Is the Prothrombin Time / INR test NABL accredited?
Yes. All lab tests on PingMeDoc, including the Prothrombin Time / INR test, are processed by NABL-accredited and ISO-certified labs. Reports are reviewed and available on your dashboard.
Is home sample collection free for this test?
Yes. Home sample collection for the Prothrombin Time / INR test is free when booking through PingMeDoc. A phlebotomist visits your home or office at your scheduled time slot.
What conditions does the Prothrombin Time / INR test help screen for?
Prothrombin Time (PT) with INR measures how long your blood takes to clot via one of the main clotting pathways. It is the standard test for monitoring warfarin (blood-thinner) therapy and for assessing liver function and bleeding risk. It is commonly used for: Monitoring warfarin therapy, Pre-surgical bleeding assessment, Liver function evaluation, Investigating bleeding tendency.
How should I prepare for the Prothrombin Time / INR test?
No fasting required. Take warfarin at your usual time and tell the lab your dose. Mention any recent change in medicines or diet (vitamin K-rich foods).
Test details are for general information only and not a substitute for medical advice. Reference ranges vary between labs. Always discuss results with a registered medical practitioner before starting, stopping or changing any treatment.
₹249₹1,11978% OFF
Free home collection
What this test measures
3 parameters in the Prothrombin Time / INR
The Prothrombin Time / INR reports the following parameters. Reference ranges are typical adult values from NABL-accredited partner labs and may vary slightly by lab, age and sex — always read results with your doctor.
Parameter
Reference range
Unit
Prothrombin Time
11–15
sec
INR
0.8–1.2
ratio
PT Control
11–13
sec
Book Prothrombin Time / INR with free home collection in your city
Home sample collection by NABL-accredited partner labs across India — from ₹249. Choose your city:
Prothrombin Time (PT) with INR measures how long your blood takes to clot via one of the main clotting pathways. It is the standard test for monitoring warfarin (blood-thinner) therapy and for assessing liver function and bleeding risk.
What conditions does the Prothrombin Time / INR detect?
The Prothrombin Time / INR helps detect and monitor conditions including Over- or under-anticoagulation, Liver dysfunction, Vitamin K deficiency, Clotting disorders.
How should I prepare for the Prothrombin Time / INR?
No fasting required; Take warfarin at your usual time; Bring your warfarin dose card or recent INR log; Citrate plasma collection — special tube; Avoid grapefruit and vitamin K-rich foods (kale; spinach) the day before if recently restarted; Download report from dashboard
What is the normal range for the Prothrombin Time / INR?
PT: 11–13.5 seconds
INR (not on blood thinners): 0.8–1.1
INR target on warfarin: usually 2.0–3.0 Note: reference ranges may vary by laboratory and should be interpreted by your doctor in the context of your overall health.
How much does the Prothrombin Time / INR cost?
The Prothrombin Time / INR is available at Rs 249 (MRP Rs 1119) on PingMeDoc with free home sample collection across India. Prices are inclusive of sample collection charges.
