No urine output (typically under 100 mL/day) — a severe sign of kidney failure or obstruction that usually requires urgent evaluation.
Anuria (urine output under ~100 mL/day) indicates the kidneys have essentially stopped producing urine — from severe AKI, end-stage kidney failure, complete urinary obstruction, or circulatory collapse. It is more severe than oliguria and carries immediate risks: fluid overload, hyperkalemia, and acidosis. Evaluation is urgent and includes imaging to rule out obstruction and assessment of volume status; dialysis may be required to manage the consequences while the cause is addressed.
Low urine output (under ~400-500 mL/day) — a key AKI criterion and a sign that the kidneys are not clearing fluid and waste effectively.
A sudden drop in kidney function over hours to days - reversible if caught early, but a major risk factor for chronic kidney disease.
The medical treatment that artificially performs the kidney's filtering functions — removing waste, toxins, and excess fluid from the blood when kidneys fail.
Excess extracellular fluid volume in kidney patients from inadequate excretion, causing edema, hypertension, pulmonary congestion, and increased cardiovascular risk.
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