The capacity of the urinary bladder varies with age in infants and children. Hjalmas reported an equation for estimating bladder volume by age for infants and children.
Patient selection: infant and child
Parameters:
(1) age in years
(2) maximum voided volume in mL
estimate for normal urinary bladder volume in mL =
= 30 * ((age in years) + 1)
normal maximum urinary flow during micturition in mL per second =
= SQRT(voided volume in mL)
maximum voided volume to estimated bladder volume ratio =
