polyuria
Pronunciation: pol-ee-YOO-ree-ah
Excessive urination characterized by urine output greater than 2-3 mL/kg/hour in children.
Full Definition
Polyuria refers to abnormally increased urine production, typically defined as greater than 2-3 mL/kg/hour in pediatric patients or more than 3 liters per day in adolescents. In pediatric nephrology, polyuria can indicate various conditions including diabetes insipidus, diabetes mellitus, or tubular disorders. The condition may present with accompanying polydipsia (excessive thirst) and can lead to dehydration if fluid intake doesn't compensate for losses. Assessment requires careful measurement of urine output and consideration of the child's age, weight, and fluid intake patterns.
Usage
Usage note: Distinguish from pollakiuria (frequent urination of normal volumes) and ensure age-appropriate reference values when documenting.
In Context
- "The 8-year-old patient presented with polyuria producing 4 mL/kg/hour of dilute urine." — Clinical assessment report
- "Polyuria in this case was secondary to nephrogenic diabetes insipidus." — Discharge summary