Urine Protein

Your kidneys run your whole blood supply through about a million tiny filters called glomeruli. Each one sorts molecules by size and charge, holding albumin back in your bloodstream while waste passes through. In a normal day, under 150 mg of protein leaves in your urine.

When that filter barrier gets stressed, more protein slips through into your pee. A test pad on the dipstick changes color to flag it. The pad reads concentration, not total amount, so how hydrated you are shifts the result. The same grade means more protein lost when your urine is dilute.

This number tells you how well your kidney filters are working, often before any symptom or drop in function shows up. A single positive reading is usually nothing to act on. Fever, a hard workout, dehydration, or standing all day can each cause a brief, harmless blip.

What counts is whether it sticks around. Protein showing up again and again is a recognized sign of kidney stress, and it tends to track with higher heart and stroke risk. The upside is real: caught early, it usually responds well to tighter blood pressure and blood sugar. Treat this as a clue, not a verdict. A repeat dipstick or a urine albumin-to-creatinine ratio confirms it, read alongside your other markers and your clinician.