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Voiding pattern in healthy newborns.

G Gladh1, D Persson, S Mattsson

  • 1Department of Health and Environment, Division of Pediatrics, Faculty of Health Sciences, Linköping, Sweden. gunilla.gladh@ped.us.lio.se

Neurourology and Urodynamics
|February 19, 2000
PubMed
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This study establishes normal voiding parameters in healthy newborns, finding they void hourly with significant variability. Healthy infants did not leak urine during bladder provocation tests.

Area of Science:

  • Neonatal physiology
  • Pediatric urology

Background:

  • Investigating bladder dysfunction in infants often uses a 4-hour observation period.
  • Establishing normative data is crucial for interpreting infant voiding patterns.

Purpose of the Study:

  • To establish reference values for voiding frequency, intervals, volumes, and residual urine in healthy newborns.
  • To assess the utility of a 4-hour observation protocol for neonatal voiding assessment.

Main Methods:

  • A 4-hour observation protocol was applied to 51 healthy newborns (3-14 days old).
  • Voiding parameters, feeding, sleeping, crying, defecations, and urinary stream were recorded.
  • Provocation tests were used to assess urinary leakage.

Main Results:

Related Experiment Videos

  • Healthy newborns voided approximately once per hour with a median volume of 23 mL.
  • Significant inter- and intra-individual variability was observed in all voiding parameters.
  • Double voidings and sizable residual urine volumes were common; diuresis was high compared to school children.
  • No urinary leakage occurred during provocation tests.

Conclusions:

  • The 4-hour observation protocol provides valuable reference data for neonatal voiding.
  • Healthy newborns exhibit considerable variability in voiding parameters and can retain significant residual urine.
  • Neonatal bladders demonstrate continence during provocative maneuvers.