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Prothrombin Time (PT) and International Normalized Ratio (INR)

The Prothrombin Time (PT) and International Normalized Ratio (INR) test is a blood test used to evaluate the blood's ability to clot. It specifically measures the time it takes for your blood to clot, which is known as prothrombin time.

Prothrombin is a protein produced by your liver and is one of the many factors your body needs to clot blood. The INR, on the other hand, is a calculation based on the PT test results and provides a standardized, consistent result irrespective of the testing methods used by different laboratories.

  • Test NameProthrombin Time (PT) and International Normalized Ratio (INR)
  • Sample TypeBlood
  • Preparations RequiredNo specific preparation is needed before this test. Please continue your usual diet and medications, unless otherwise instructed by your healthcare provider.
  • Report Time4 hours
PT (Prothrombin Time) and INR (International Normalized Ratio) test Uses:

  • Monitoring Warfarin Therapy : PT/INR tests are primarily used to monitor the dosage and effectiveness of the anticoagulant drug warfarin. Warfarin is used to prevent blood clots, and these tests help ensure that the medication is within a safe and effective range.

  • Assessing Bleeding Disorders : PT/INR tests can also aid in diagnosing bleeding disorders or assessing liver function, as they can reflect the overall clotting ability of blood.

PT (Prothrombin Time) and INR (International Normalized Ratio) test Procedure:

  • Blood Sample Collection : A healthcare professional will draw a blood sample, usually from a vein in your arm.

  • Lab Analysis : The blood sample is sent to a laboratory where it is tested for PT and INR levels.

  • Calculation : The PT test measures how long it takes for the blood to clot. The INR is a standardized way of expressing the PT test result, which helps to monitor blood clotting more consistently across different labs.

  • Test Report : The test report typically includes the following information:

  • PT Result : Given in seconds, indicating the time it takes for blood to clot.

  • INR Result : A ratio comparing the patient's PT to a normal reference value. A higher INR indicates a longer time to form a clot.

  • Target Range : For patients on warfarin, the report often includes the recommended therapeutic range for the INR.

  • Interpretation : The report may interpret the results as "within therapeutic range, " "too high" (increased risk of bleeding), or "too low" (increased risk of clotting) based on the target range and the patient's condition.

Home Sample Collection Process

1
Book your convenient slot
Book your convenient slot
2
Sample Collection by Phlebotomist
Sample Collection by Phlebotomist
3
Reporting of the sample at lab
Reporting of the sample at lab
4
Download Reports
Download Reports
Frequently Asked Questions

PT (Prothrombin Time) and INR (International Normalized Ratio) tests are measures used to assess the clotting ability of blood. PT evaluates the time it takes for the blood to clot, while INR standardizes these results to ensure consistency across different laboratories.

High PT and INR values suggest that the blood takes longer to clot than normal. This could indicate a potential risk for excessive bleeding or difficulty in stopping bleeding.

PT INR monitoring involves regular testing to evaluate blood clotting time, especially in individuals taking blood-thinning medications like warfarin. This monitoring helps ensure that the blood's ability to clot remains within a safe range, preventing both clotting and bleeding issues.

Generally, fasting is not required for a PT INR test.

The normal range for PT is usually around 11 to 13. 5 seconds. The INR value for individuals not on anticoagulants is around 0. 8 to 1. 2.

The best time for an INR test largely depends on an individual's specific circumstances and their healthcare provider's guidance. However, it's often recommended to maintain consistency by testing at the same time of day for each measurement.

Prothrombin time (PT) is a blood test that measures the time it takes for blood to clot. It assesses the extrinsic pathway of the coagulation cascade.

A dangerous INR level varies based on individual health conditions and medication use. However, an INR level significantly above the therapeutic range for an individual (often above 4. 0 or higher) might indicate a higher risk of bleeding and requires immediate medical attention.

PROTHROMBIN TIME WITH INR, SODIUM CITRATE WHOLE BLOOD
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