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).
INR (international normalized ratio) tests are important in helping your healthcare provider determine your response to COUMADIN. INR tests check to see how fast your blood clots. The INR test is primarily used to monitor warfarin therapy, where the aim is to maintain an INR in target range. Your healthcare provider will decide what INR numbers are best for you and may adjust your dose of COUMADIN to keep your INR in your target range.
INR stands for International Normalized Ratio. As its name suggests, one INR result can be compared to another INR result regardless of how or where the result was obtained. So, the INR is really just the standard unit used to report the result of a PT test. There are a few things worth mentioning about the INR.