An earlier or variant spelling of creatinine; a waste product produced by muscle metabolism that is excreted in urine.
From 'creatin' plus the chemical suffix '-in.' This compound is formed when creatine is broken down, and it became an important diagnostic marker in medical tests for kidney function.
Your doctor measures creatinine levels in blood tests because it's one of the clearest indicators of kidney health—kidneys that don't work well can't filter it out properly, making it rise in the bloodstream.
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