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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.
Oliguria is urine output below roughly 400-500 mL/day and is one of the KDIGO criteria for acute kidney injury. Causes range from prerenal (dehydration, heart failure) to intrinsic renal injury and obstruction. It matters clinically because low output means fluid and potassium accumulate — driving overload and hyperkalemia. Management targets the cause, restores volume where appropriate, and monitors fluid balance and potassium closely; severe or prolonged oliguria with complications leads to dialysis.
No urine output (typically under 100 mL/day) — a severe sign of kidney failure or obstruction that usually requires urgent evaluation.
A sudden drop in kidney function over hours to days - reversible if caught early, but a major risk factor for chronic kidney disease.
Excess extracellular fluid volume in kidney patients from inadequate excretion, causing edema, hypertension, pulmonary congestion, and increased cardiovascular risk.
The medical treatment that artificially performs the kidney's filtering functions — removing waste, toxins, and excess fluid from the blood when kidneys fail.
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