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Abstract
Functional bladder capacity and Urine Calcium/creatinine quota were investigated in 13 patients with primary nocturnal enuresis, 15 former enuretic patients and 15 controls. The functional bladder capacity was measured in ml and determined by a standardised daytime oral water load test which was performed in the homes. There was an age-related increase in bladder capacity in all three groups. There was no significant difference between any of the groups in bladder capacity. There wasn't any elevation of the calcium/creatinine quota in the enuretic patients, but former enuretic children had an increased calcium creatinine quota in the morning urine. Calcium/creatinine quota was also studied in 15 adult former enuretics and 15 adult control individuals without finding any difference between the groups. This investigation suggests that the functional bladder capacity is not a major pathogenic factor in primary nocturnal enuresis.