Background Sickle cell disease (SCD) is an inherited chronic disease that is characterized by complications such as recurrent painful vaso-occlusive events that require frequent hospitalizations and contribute to early mortality. Scale. Results The PedsQL? SCD Module Scales evidenced excellent feasibility excellent reliability for the Total Scale Scores (patient self-report α = 0.95; parent proxy-report α = 0.97) and good reliability for the nine individual scales (patient self-report α = 0.69-0.90; parent proxy-report α = 0.83-0.97). Intercorrelations with the PedsQL? Generic Core Scales and PedsQL? Multidimensional Fatigue Scales were medium (0.30) to large (0.50) range supporting construct Ginsenoside F1 validity. PedsQL? SCD Module Scale Scores were generally worse for patients with severe versus moderate disease. Confirmatory factor analysis demonstrated an acceptable to excellent model fit. Conclusions The PedsQL? SCD Module demonstrated acceptable measurement properties. The PedsQL? SCD Module may be utilized in the evaluation of SCD-specific health-related quality of life in clinical research and practice. In conjunction with the PedsQL? Generic Core Scales and the PedsQL? Multidimensional Fatigue Scale the PedsQL? SCD Module will facilitate the understanding of the health and well-being of children with SCD. Keywords: Sickle Cell Disease PedsQL pediatrics children health-related quality of life patient-reported outcomes Introduction Sickle cell disease (SCD) is an inherited chronic disease characterized by complications such as recurrent painful vaso-occlusive events that require frequent hospitalizations. Prior work using generic health-related quality of life (HRQOL) instruments have demonstrated that patients with SCD experience significantly impaired HRQOL in their baseline health that worsens during acute complications. [1-4]. Generic HRQOLinstruments allow comparison of populations with different diseases or to healthy patients but are limited when evaluating disease-specific functioning. Disease-specific HRQOL devices are designed to evaluate functioning specific to a particular disease and are better able to detect differences within a populace of patients. To the best of our knowledge a validated pediatric SCD-specific HRQOL instrument does not exist in the empirical literature. In order to better Ginsenoside F1 understand differences in health Ginsenoside F1 status within the population of children with SCD and to enhance the ability to measure the impact of disease modifying therapies from the patient’s and parent’s perspectives we developed the PedsQL? SCD Module to address this significant gap in the literature . Understanding the basic measurement properties of Ginsenoside F1 this disease-specific HRQOL instrument is critical prior to utilizing it in clinical trials and clinical practice. The objective of this study was to determine the initial measurement properties Ginsenoside F1 for the child self-report and parent proxy-report versions of the new PedsQL? SCD Module including feasibility reliability and validity. We hypothesized that children with more severe SCD would have worse HRQOL than those with moderate disease as measured by the PedsQL? SCD Module and that the SCD-specific scales would be significantly associated with generic HRQOL and fatigue. Methods Study Populace and Procedures Data collection place between June 2010 and August 2012 Participants were children ages 5-18 years and parents of children ages 2-18 years with ARMD5 a physician confirmed diagnosis of SCD (any genotype) at five clinical centers across Ginsenoside F1 the United States (Medical College of Wisconsin/Children’s Hospital; University of Texas Southwestern/Children’s Medical Center Dallas; Baylor College of Medicine/Texas Children’s Hospital Houston; Jonathan Jaques Children’s Cancer Center/Miller Children’s Hospital Long Beach CA; University of Alabama at Birmingham/Children’s of Alabama). The study populace includes a convenience sample of eligible patients and/or parents who presented for a clinic visit. Children known to the clinical team to have cognitive impairment that would prevent them from understanding questions on the instrument were excluded. The human subjects institutional review boards at each center approved the study. Steps The PedsQL? Sickle Cell Disease Module The PedsQL? SCD Module was developed through a literature review of relevant research consultation with SCD experts focus interviews cognitive interviews and pre-testing protocols . Development of the items for the PedsQL? SCD Module began in May 2008 . The child self-report items are listed in Supplemental Appendix I. The 43-item.