OBJECTIVES-Enuresis and nocturia are common among children with sickle cell anemia (SCA). The objectives of this study were to describe the prevalence of enuresis and nocturia among children and young adults with SCA and determine the relationship, if any, between these symptoms and SCA-related morbidity.METHODS-A prospective infant cohort of African-American children with SCA was previously established from the Cooperative Study for Sickle Cell Disease. Included in this cohort were children with SCA enrolled before 6 months of age for whom questions about enuresis and nocturia had been completed.RESULTS-A total of 213 participants were included in this analysis. Sixty-nine individuals (33%) experienced enuresis over the course of the study. No children under 6 years of age were asked about enuresis. Thereafter, enuresis was most prevalent between the ages of 6 and 8 years (42%) and continued to be common in young adults ages 18 to 20 years (9%). Seventy-nine percent of individuals reported a history of nocturia. There was no association between enuresis or nocturia and an increased rate of pain or acute chest syndrome (ACS) episodes.CONCLUSIONS-Enuresis and nocturia are common in children with SCA. Among adults with SCA, enuresis and nocturia are more persistent compared with adults in the general population. Enuresis and nocturia are not associated with an increased rate of pain or ACS.Enuresis and nocturia are common problems for individuals with sickle cell anemia (SCA). 1,2 Prevalence estimates of enuresis in children with SCA range from 20% to 69%, 1-7 , whereas nocturia has been described in up to 68% of children with SCA. 1 Among the general pediatric population, the prevalence of enuresis at age 5 years is 15%, 8 and the prevalence of nocturia is 40% in children ages 6 to 11 years. 9 The prevalence of enuresis and nocturia decreases with age in the general population, and in young adults enuresis and nocturia are present in 1% to 2% and 3%, respectively. 10,11 The reason why enuresis and nocturia are more common in SCA is not well defined. Multiple factors may contribute to the underlying mechanism of enuresis and nocturia among individuals with SCA including a decreased ability to concentrate urine and a low maximum functional bladder capacity. 1,12 Sickle cell anemia is one of the most common genetic diseases in the United States, affecting 1 in 600 African-American births. 13 Vaso-occlusion due to rigid sickle erythrocytes causes many of the complications associated with SCA. SCA-related morbidities attributable to vasoocclusion include pain and acute chest syndrome (ACS) Several studies have reported the prevalence of enuresis and nocturia among children with SCA; however, few data exist describing how the prevalence of enuresis and nocturia changes as children become young adults. In a cross-sectional study of 987 children with SCA, Mabiala Babela et al. reported a 59% prevalence of enuresis in children ages 5 to 10 years, which decreased to 16% at 16 years of age. 5 Few studies have report...