Functional Ovarian Reserve in Sickle Cell Disease

This study aims to look at AMH levels in female children with SCD as they go through puberty to see if they are at the same level as other children without SCD at the same age and/or pubertal stage and will also look at how treatment exposures and pain crises affect the AMH levels in children with SCD. Primary Objective: * To evaluate whether AMH levels are lower in pre-teens and adolescent females with SCD when compared with healthy female controls (siblings, relatives, non-relatives of similar race/ethnicity) at the same age and pubertal stage. Secondary Objectives: * To evaluate whether AMH has a similar trajectory in female pre-teens and adolescents with SCD when compared with the general population and controls. * To describe pubertal timing, menstrual history, and markers of functional ovarian reserve (FOR), as well as prevalence of premature ovarian insufficiency (POI) as determined by medical history and laboratory markers in pre-teens and adolescents with SCD in comparison with their female controls. * To correlate AMH levels with FSH and estradiol levels, normal pubertal timing, and menstrual history in children and adolescents with SCD. * To correlate the severity of SCD (number of vaso-occlusive events) with pubertal timing, presence of normal vs abnormal menstruation, and laboratory markers of FOR, in pre-teens and adolescents with SCD. * To correlate the use of SCD modifying treatment modalities with pubertal timing, menstrual pattern, and laboratory markers of FOR in pre-teens and adolescents with SCD.