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Haemoglobin and red blood cell reference intervals during infancy.

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Updated infant hematology reference data is crucial. This study established new reference intervals for hemoglobin and red blood cell biomarkers in Swedish infants, revealing narrower ranges and age-dependent variations.

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Area of Science:

  • Pediatrics
  • Hematology
  • Clinical Chemistry

Background:

  • Establishing accurate hematological reference data for infants is essential for diagnosing and managing various conditions.
  • Previous reference intervals may not reflect current infant populations or practices, such as delayed cord clamping.

Purpose of the Study:

  • To define updated reference intervals for hemoglobin and red blood cell biomarkers in a large cohort of longitudinally followed Swedish infants.
  • To provide age-specific reference data crucial for accurate interpretation in pediatric hematology.

Main Methods:

  • A longitudinal cohort study involving 442 healthy, term-born Swedish infants with delayed umbilical cord clamping.
  • Blood samples were collected at multiple time points: umbilical cord, 48-118 hours, 4 months, and 12 months.
  • Reference intervals were calculated as the 2.5th and 97.5th percentiles following Clinical and Laboratory Standards Institute guidelines.

Main Results:

  • Narrower reference intervals for hemoglobin and mean cell volume were observed compared to previous studies.
  • Significant age-dependent variations in reference intervals for all measured hematological parameters were identified.
  • At 12 months, 16% of the cohort met the WHO definition of anemia (hemoglobin < 110 g/L), despite favorable birth conditions.

Conclusions:

  • The study highlights the necessity of age-specific reference intervals for infant hematological parameters.
  • The established narrower reference intervals provide a more precise benchmark for clinical assessment.
  • The observed discrepancy with WHO anemia classification warrants further investigation into factors influencing infant hemoglobin levels.