Hematologic Variations in Children With Down Syndrome

Area of Science:

• Pediatric Hematology
• Genetics and Genetic Disorders
• Clinical Pathology

Background:

• Hematologic abnormalities in children with Down syndrome (DS) are documented but lack consistent conclusions.
• Establishing reliable reference ranges for complete blood count (CBC) in DS is crucial for accurate clinical evaluation.
• Previous studies present conflicting data regarding specific CBC parameters in pediatric DS populations.

Purpose of the Study:

• To evaluate and define complete blood count (CBC) ranges specifically for children diagnosed with Down syndrome (DS).
• To provide a clinical resource by presenting mean CBC values stratified by age and sex for pediatric DS patients.
• To identify and characterize common hematologic variations observed in children with DS.

Main Methods:

• Retrospective analysis of a single-institution cohort.
• Evaluation of complete blood count (CBC) data from pediatric patients with Down syndrome (DS).
• Comparison of observed CBC parameters against established reference values.

Main Results:

• Children with Down syndrome (DS) demonstrated higher mean corpuscular volume (MCV) compared to reference values.
• A lower absolute lymphocyte count was consistently observed in the pediatric DS cohort.
• A trend toward higher hemoglobin (Hgb) values was noted in children with DS.

Conclusions:

• The identified hematologic findings (elevated MCV, reduced lymphocytes, higher Hgb trend) appear to be consistent variations in children with Down syndrome (DS).
• These variations are suggested to be benign, representing characteristic hematologic profiles in the DS population.
• The study provides essential data for the accurate interpretation of CBC results in pediatric DS evaluations.