The urine albumin creatinine ratio spots kidney damage years before filtration falls, by catching small protein leaks in a single untimed urine sample. Dividing albumin by creatinine cancels out how concentrated the urine happens to be. Results sort into three KDIGO bands, A1 below thirty, A2 up to three hundred, and A3 above, with each step carrying higher cardiovascular and kidney risk.
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A healthy glomerulus is a fine sieve that keeps albumin, one of the main blood proteins, out of urine. Long before filtration rate drops, that sieve develops leaks, and albumin begins slipping through. Because the leak starts small, a plain urine dipstick misses it, which is why guidelines ask diabetics and hypertensive patients for the far more sensitive albumin creatinine ratio every year.
Why Divide by Creatinine
Albumin concentration alone swings wildly with hydration. A dilute sample after a litre of water halves the reading without any change in the kidney. Creatinine leaves the body at a steadier rate, so dividing by it strips out the dilution effect and lets a random morning sample approximate a full day collection.
The Three Bands
Below thirty milligrams per gram is A1, normal to mildly increased, and needs only routine rescreening. Thirty to three hundred is A2, the range once called microalbuminuria, where blood pressure drugs that protect the kidney, ACE inhibitors and ARBs, earn their place even at normal pressure. Above three hundred is A3, formerly macroalbuminuria, which signals established damage and usually triggers specialist referral and tighter risk factor control.
More Than a Kidney Test
Albumin in urine doubles as a window on the whole vascular system. The same endothelial dysfunction that leaks protein in the glomerulus predicts heart attacks and strokes, so an elevated ratio calls for aggressive overall risk reduction, not just kidney watching.
Transient rises occur with fever, urinary infection, heavy exercise and menstruation, so any abnormal result deserves confirmation with a repeat first morning sample within three months before conclusions are drawn.