This content does not have an English version. This content does not have an Arabic version. Sections for Prothrombin time test About. Overview The prothrombin time, sometimes referred to as PT or pro time test, is a test to evaluate blood clotting.
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The INR test is a blood test and requires a small tube of blood from a vein — approximately 4 millilitres. It is important that the tube is filled to the correct level, otherwise false results may occur. Get on top of your general health Find and instantly book affordable GPs within Australia.
Find GPs in Australia. The result needs to be taken in context of recent INR measurements and dose changes. There are many medications that can affect the INR, and even a change in diet can result in changes to the INR — either raising or lowering it. Q: Where can I find GP clinics? Patients on warfarin take an individually tailored dose that depends on their genes, usual diet, drugs and physical activity. Initially patients have a daily blood test to check their international normalised ratio INR which indicates how long it takes the blood to clot.
People not taking warfarin have an INR of around 1 but patients with a mechanical heart valve should have an INR in the range of 2. If a patient's INR is below the target range they are at increased risk of thrombosis and above it they are at risk of bleeding complications.
Lack of knowledge on what food and drugs interact with warfarin can lead to INR levels outside the therapeutic range which can be dangerous. The study included patients with aortic stenosis who were taking warfarin.
Patients received a postal questionnaire with 28 multiple choice questions about warfarin. Questions with the least correct answers concerned food and drug interactions and when to call a doctor. Patients do not have to avoid these foods but they should eat an equal amount every week because the vitamin K will decrease their INR and put them at increased risk of thrombosis or embolism.
Patients who like to eat a lot of vitamin K containing foods can take a higher warfarin dosage but they need to be consistent. The study found that increased age was associated with decreasing correct answers.
Dr Oterhals said: "We can only speculate why.
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