polyuria

• Polyuria defined as >3 L UOP per day

• Due to an osmotic or a water diuresis; almost always due to osmotic diuresis in inpatients

• Perform a timed urine collection (6 h sufficient) and measure Uosm

• 24-h osmole excretion rate = 24-h UOP (actual or estimate) × Uosm

• Approach to polyuria : Figure:

  • when > 1000 mOsm/d → osmotic diuresis

• <800 mOsm/d → water diuresis

• Treatment-polyuria

• Algorithm of polyuria 󰒗

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