Pediatric CBC Reference Values

Critical Principles

The American Society of Hematology recommends using age-specific, analyzer-specific, and reagent-specific reference ranges when interpreting pediatric CBC results, as applying adult reference ranges to children can misclassify up to 30% of normal children as abnormal 1, 2
The International Society on Thrombosis and Haemostasis suggests that laboratories must use standardized age groupings (neonates, 1 month-1 year, 1-5 years, 6-10 years, 11-16 years) that reflect statistically different physiological states 1, 3

The American Academy of Pediatrics states that normal hemoglobin values vary significantly by age and sex in pediatric patients, with a restrictive threshold of <70 g/L being appropriate for most stable, non-bleeding children 5
The Society of Pediatric Anesthesia recommends maintaining hemoglobin >70 g/L even in conditions with limited oxygen delivery (septic shock, traumatic brain injury, post-cardiac surgery) 5

The American Association of Blood Banks suggests that blood products in children should be prescribed by volume rather than number of units, with 10 ml/kg of RBC transfusion increasing hemoglobin by approximately 20 g/L 5
The Pediatric Critical Care Society recommends the following dosing for blood components: 5-10 ml/kg of cryoprecipitate, 10-20 ml/kg of platelets, and 10-15 ml/kg of FFP 5

The American College of Medical Genetics advises against using adult reference ranges for pediatric samples, as this leads to systematic misclassification, with approximately 30% of healthy 1-5 year olds being classified as abnormal using adult ranges 1, 2
The College of American Pathologists recommends only using published ranges established with identical analyzer and reagent systems, as reagent-specific differences can significantly impact results 1, 2

The American Society of Pediatric Hematology/Oncology suggests considering prednisone 1 mg/kg/day (0.5-2 mg/kg/day) orally for 2-4 weeks with 4-6 week taper for grade 2-3 immune thrombocytopenia 6
The Society for Pediatric Research recommends platelet transfusion when count <75 × 10⁹/L in the context of obstetric hemorrhage 5

The American Society of Hematology recommends immediate hematology consultation for severe cytopenias (Grade 3-4) affecting any cell line, multiple cell line abnormalities suggesting bone marrow failure, presence of blasts or significant dysplastic changes on peripheral smear, persistent unexplained cytopenias despite initial evaluation, and suspected hematologic malignancy based on clinical or laboratory findings 6