The pee you just flushed without thinking could be a great sample to know what is going on in your body!

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Sources:
https://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0072534/
http://www.webmd.com/a-to-z-guides/urine-test#1
https://labtestsonline.org/understanding/analytes/urinalysis/tab/test/
https://www.uptodate.com/contents/urinalysis-in-the-diagnosis-of-kidney-disease

Image Source:
https://www.youtube.com/watch?v=jhmzkUcAbIM
https://commons.wikimedia.org/wiki/Category:Nitrite_ion#/media/File:Nitrite-3D-vdW.png
https://commons.wikimedia.org/wiki/File:Crystals_in_urine_-_uc_--_very_high_mag.jpg
https://commons.wikimedia.org/wiki/File:Cast_nephropathy_-_2_cropped_-_very_high_mag.jpg
https://commons.wikimedia.org/wiki/File:Nitrate-3D-balls.png