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.
GFR is like measuring how fast your kidney's coffee filter works—healthy kidneys filter about half a cup of blood every minute! The glomerulus really does look like a tiny ball of yarn made of blood vessels, and when it gets damaged, your GFR drops like a clogged filter slowing down coffee brewing.
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