A measure of how much blood the kidneys filter per minute, calculated using creatinine levels and patient factors. It's the best overall indicator of kidney function, with normal GFR being 90-120 mL/min/1.73m².
From Latin 'glomus' meaning 'ball of yarn' (referring to the glomerulus structure), 'filtrare' meaning 'to strain through felt,' and 'rate' from Latin 'rata.' The concept developed as understanding of kidney physiology advanced in the 20th century.
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