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Bladder diary (48 hours)

The most useful source of information for wetting, frequent urination or sudden urges. Fill it in for two days and bring it to the appointment.

Expected bladder capacity

Formula: (age + 1) × 30 ml, for ages 4–12. If the largest voided volume in the diary is below 65% or above 150% of this number, the doctor will assess it.

How to fill it in

  1. Choose two days when your child follows a normal routine, for example a weekend.
  2. Each time your child pees, have them pee into a measuring cup and write down the amount in ml.
  3. Write down everything your child drinks (water, milk, tea, juice, soup) and how much.
  4. Note any sudden, strong urge to pee, any wetting and any wet underwear.
  5. Note whether your child wet the bed at night. To work out the night urine volume, subtract the weight of a dry diaper of the same type from the weight of the used diaper (a 1 g difference is about 1 ml of urine). Add the measured volume of any pee in the toilet during the night and the first pee in the morning. If a measurement is incomplete, note this, and do not write the missing volume as zero.
  6. Do not count the first morning pee when working out the largest daytime voided volume.
  7. Also note the time and form of bowel movements.

Bladder diary (48 hours)

Child’s name and age: ______________________________

Day 1: ____ / ____ / ______

TimeDrank (what, ml)Urine (ml)Strong urge / wettingBowel movement

Bedwetting at night: yes / no. Used diaper: ____ g. Dry diaper: ____ g. Toilet at night: ____ ml. First morning pee: ____ ml.

Day 2: ____ / ____ / ______

TimeDrank (what, ml)Urine (ml)Strong urge / wettingBowel movement

Bedwetting at night: yes / no. Used diaper: ____ g. Dry diaper: ____ g. Toilet at night: ____ ml. First morning pee: ____ ml.

Sources

  1. Austin PF, Bauer SB, Bower W, et al. The standardization of terminology of lower urinary tract function in children and adolescents: update report from the standardization committee of the International Children’s Continence Society. Neurourol Urodyn. 2016;35(4):471–481.
  2. Nevéus T, Fonseca E, Franco I, et al. Management and treatment of nocturnal enuresis: an updated standardization document from the International Children’s Continence Society. J Pediatr Urol. 2020;16(1):10–19.
  3. EAU Guidelines on Paediatric Urology, 2025: Daytime lower urinary tract conditions; Monosymptomatic nocturnal enuresis.
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