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I came from my doctor and he did a urine sample and said there was blood in my urine. I've never seen "blood" in my urine or had any issues with my kidneys so I was perplexed by this. Is this possible to have blood in urine without actually seeing it?

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Yes. what you are describing sounds like microscopic hematuria (1). Sometimes red blood cells(RBC) are not numerous enough to be visible in urine. Yet, when tested, RBCs are detected.

(1) http://www.nejm.org/doi/full/10.1056/NEJMcp012694

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    This is so close to being a really good answer. A reference with a little more explanation would be a big improvement. – Carey Gregory Apr 20 '17 at 1:39
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The presence of blood in the urine is called Hematuria. It can be detected in the microscopic lab tests. Please contact a nephrologist doctor for quick treatment.

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Yes it is possible and it is called microscopic hematuria. Etiologies of microscopic hematuria range from incidental causes to more serious ones.Further assessment is needed to stablish its meaning.

  • Welcome to Health.SE. Since health is an important topic, the site has a strict policy that all answers should be backed up with reliable references in order to provide the community with the means to assess the merit of the answer, regardless of the reader's background. See this list of reliable sources. If you still have trouble with this, feel free to visit the help center. – Narusan Apr 20 '17 at 10:32
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    This is the same answer as was already posted, and of less use as there is nothing corroborating it. – JohnP Apr 20 '17 at 21:50

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