Blood in the urine is quite common. If we did a urine test on everyone, we'd probably find microscopic blood in about 5% of all people. Although the number might be as high as 30%, depending on how we define the cutoff of the numbers of blood cells in the urine that we decide is abnormal. Peeing visible blood where the urine is actually pink or red is much less common and only happens in about one out of every 250 people. In either case it requires a workup.
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