How many tests can be performed to estimate urea? & the significant of presence or absence of urea? Thanks

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sciftw | High School Teacher | (Level 1) Educator Emeritus

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As many tests as possible. That is going to differ by person, hydration, kidney health and a variety of other factors as well.  A person could perform as few as one test too. Science typically avoids doing only a single test though because performing multiple tests allows a scientist to look at averages and minimize the potential effects of scientific error.  In addition, a good test is a repeatable test. So if a medical professional tests for urea amounts but is unable to do the test again, those initial results are not super reliable. They might be 100% accurate, but without a second test, the results cannot be confirmed. So at a minimum, two tests would be needed for accurate results. More tests just means more reliable data.

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