Blood tests for those taking anticoagulants

When taking an anticoagulant, it is important to have your blood tested regularly to ensure you are taking your medications safely and are not at increased risk for bleeding

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Prothrombin time (PT): PT is a test to determine how fast it takes for your blood to clot. Usually when taking a "blood thinner," such as warfarin (Coumadin), the desired PT is about 1 1/2 times normal. When checking PT, your doctor will receive the results and let you know if you are taking the correct amount of blood thinner medication.

Target value:
Normal range for an adult: 9.9-13 seconds.

Preparation:
This test may be measured any time of the day without fasting.

International normalized ratio (INR): INR is tested for those on anticoagulant medications to prevent stroke, embolism, and heart attack.

Target value: Normal level for an adult: 0.9-1.2. Your doctor will determine your therapeutic range.

Preparation: This test may be measured any time of the day without fasting.