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On acenocoumarol. Will it affect the results of INR test?

What is the half life of acenocoumarol?If the dose is taken at 8pm and the test is done the next day at 7pm,is there a possibility of INR falling from a level of 2.9 to 1.2 as has been in my case when tested after 1 month,continuing the same level of dosage as 1mg daily.What are the margins of experimental errors in INR test at a prestigious lab?
Asked On : Wed, 18 Apr 2012
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  User's Response

Thank you for posting your query.

PT/INR test is an important test to determine the exact dose needed to maintain adequate anticoagulation.

A higher INR indicates more than normal blood thinning, and may increase the chance of bleeding.

A lower INR indicates inadequate blood thinning, and may predispose to clotting of blood.

The best time to take anticoagulant is in the evenings, and the best time to do the INR is in the morning.

There are several chances of error in this report, such as use of any other medications, change of diet, laboratory errors, such as delay in doing the test, etc.

Best wishes,

Dr Sudhir Kumar MD DM (Neurology)

Answered: Thu, 20 Dec 2012
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