INCREASED URINARY FREQUENCY

Increased Urinary Frequency No Polyuria Urine output < 7 mL/kg/hr and appropriate for intake Urinalysis & Urine Culture Urine culture positive → Urinary Tract Infection See “Genitourinary Complaints: Clinical approach to Dysuria” Urine culture negative → Other causes: Urinary obstruction (e.g., Nephrolithiasis) Small volume bladder Detrusor hyperactivity Vulvovaginitis Constipation Bladder compression Mass Pregnancy Polyuria Urine output > 7 mL/kg/hr or inappropriately high for intake Check serum and urine osmolality Urine Osmolality > Serum Osmolality → Osmotic Diuresis Diabetes Mellitus Renal Failure (high output) Iatrogenic (Mannitol, NaCl) Urine Osmolality < Serum Osmolality → Water Diuresis Perform water deprivation test: Hypotonic urine → Diabetes Insipidus Central Diabetes Insipidus Nephrogenic Diabetes Insipidus Hypertonic urine → Primary Polydipsia *Indicates Key Condition This is not an exhaustive list of medical conditions.