**Question:** A 5 year-old girl is referred for evaluation of bed-wetting. The mother states that her daughter has never fully gained control of her bladder. It took her an extended period of time to grow out of diapers and the girl has finally stopped having "accidents" during the day. However, she continues to wet her bed at night. The patient has developed normally in all other aspects and will be staying in kindergarten in three months. Both her mother and father are extremely frustrated and have been losing sleep, as the girl wakes up at night 4 to 5 times per week. Physical examination is unremarkable. Which of the following will most likely be the result of further investigation?

A. Hypothyroidism
B. Autism Spectrum Disorder (ASD)
C. Nocturnal polyuria
D. Enuresis

**Correct Answer:**

**Core Concept:**
The case described presents a 5-year-old girl suffering from nocturnal enuresis, which is the medical term for bed-wetting in children. Enuresis is the involuntary loss of urine at night, even after the age of five years. It is a common issue in children and can be caused by various factors.

**Why the Correct Answer is Right:**

Further investigation is required to identify the specific cause behind the child's bed-wetting. In this case, the correct answer is "D. Enuresis" because it is the most likely diagnosis for the presented symptoms. Although the child has been delayed in potty training and continues to wet her bed at night, there are no significant developmental, neurological, or hormonal issues mentioned, ruling out options A (Hypothyroidism) and C (Nocturnal polyuria).

**Why Other Options are Incorrect:**

A. Hypothyroidism is a hormonal disorder that affects the thyroid gland, resulting in low thyroid hormone levels. In this scenario, there is no mention of any hormonal abnormalities or developmental delays, making option A unlikely.

B. Autism Spectrum Disorder (ASD) is a neurodevelopmental disorder that affects social interactions, communication skills, and repetitive behaviors. The presented case does not mention any behavioral, social, or developmental concerns associated with ASD, rendering option B incorrect.

C. Nocturnal polyuria refers to an excessive production of urine at night. In this case, the child is still wetting her bed at night, suggesting the need for further evaluation rather than assuming nocturnal polyuria as the primary cause.

**Clinical Pearls:**

1. Enuresis, also known as bed-wetting, is a common issue among children, affecting approximately 15% of five-year-olds. It is usually due to underlying factors such as incomplete bladder control development, sleep disturbances, or psychological concerns.
2. In some cases, bed-wetting might be a symptom of a more significant issue, like neurogenic bladder dysfunction, sleep disorders, or psychological concerns. Further evaluation and management by a pediatrician or pediatric urologist are recommended to identify the underlying cause and devise an appropriate treatment plan.
3. A thorough medical