Library
Endocrine
·
medium
Suspected Polyuria
Flowchart
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Confirm volume, then classify diuresis.
Decision
Outcome
Decision
Suspected polyuria. First test?
✓
Complete 24-hour urine collection
Decision
24-hour urine output?
✓
>3 L → polyuria
✓
<3 L → not true polyuria; work up urinary frequency
Decision
Urine concentration?
✓
Dilute → water diuresis (primary polydipsia or DI)
✓
Concentrated → osmotic diuresis (glucose, urea, saline)
Outcome
Water deprivation test to distinguish primary polydipsia, central DI, nephrogenic DI
Outcome
Investigate solute: glucose (DM), urea (high-protein/renal), saline diuresis (post-AKI)
Outcome
Workup for urinary frequency (UTI, OAB, BPH)