Normal Urine Output: What's Healthy?

Normal adult urine output: 1–2 liters/day (urinate every 2–4 hours). Volume varies with fluid intake, activity, medications, and climate.

Key Points

• Oliguria: <400 mL/day (or <0.5 mL/kg/hr) – suggests dehydration, kidney dysfunction, obstruction.
• Polyuria: >3 L/day – suggests diabetes (mellitus/insipidus), diuretic use, polydipsia.
• Nocturia: >2 voids/night – may indicate OSA, heart failure, prostate issues, or excessive evening fluids.

When to Consult a Doctor

• Persistent change in frequency/volume without clear cause.
• Pain, blood, color change, or foam.
• Associated symptoms (thirst, edema, fatigue).

Your doctor can evaluate with history, urinalysis, blood tests, and imaging if needed.