Notice that in this case (as in many cases), population does not refer to people, but to bags of potato chips. To be concise, researchers often use symbols in place of words. Greek letters are usually used when referring to populations (the entire group being studied, from which a sample or samples will be drawn).
A blood test is needed to determine the effect of warfarin for each person and this is measured as the International Normalised Ratio or INR. The INR is a measure of how long it takes for blood to clot. The INR for a person not taking warfarin is 1. The higher the INR, the longer it takes for blood to clot. The desired INR for you will depend on the reason for which you are taking warfarin. Your doctors will try and keep your INR within a range â called the target INR range.
A: INR, or international normalized ratio, is a blood test done to check how thick or thin the blood is. INR is used to monitor Coumadin (warfarin) therapy. Coumadin is a blood thinner used to prevent blood clots in patients with a history of clots or certain heart conditions.oumadin (warfarin) is a blood thinner used to prevent the formation of blood clots, to prevent heart attacks and strokes. When you're on warfarin, your doctor must monitor your INR levels to ensure that your blood is not too thin, which can lead to an increased risk of internal bleeding.