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Hypocalcemia in the newborn.

R Aggarwal1, M Upadhyay, A K Deorari

  • 1Division of Neonatology, Department of Pediatrics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India.

Indian Journal of Pediatrics
|January 5, 2002
PubMed
Summary
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Newborns experience a natural drop in serum calcium levels within 48 hours. High-risk infants may develop early hypocalcemia requiring prompt calcium treatment, while ionized calcium is key for diagnosis.

Area of Science:

  • Neonatal physiology and endocrinology
  • Pediatric critical care

Background:

  • Healthy term infants typically reach a physiological nadir in serum calcium levels between 24-48 hours of age.
  • This nadir is potentially linked to a delayed hormonal response involving parathyroid hormone and calcitonin in newborns.
  • Certain high-risk neonates, including infants of diabetic mothers, preterm infants, and those with perinatal asphyxia, are susceptible to hypocalcemic levels during this period.

Purpose of the Study:

  • To describe the physiological nadir of serum calcium in healthy term newborns.
  • To differentiate between early-onset and late-onset hypocalcemia in neonates.
  • To highlight the importance of ionized calcium over total serum calcium for accurate diagnosis.

Main Methods:

  • Review of physiological processes in neonatal calcium homeostasis.

Related Experiment Videos

  • Analysis of factors contributing to hypocalcemia in high-risk neonatal populations.
  • Discussion of diagnostic criteria and treatment durations for early and late-onset hypocalcemia.

    • Main Results:

    • Early-onset hypocalcemia, presenting within 72 hours, necessitates calcium supplementation for at least 72 hours.
    • Late-onset hypocalcemia, typically appearing after 7 days, requires extended long-term therapy.
    • Ionized calcium levels are critical for biochemical functions and are a more reliable diagnostic marker than total serum calcium.

    Conclusions:

    • Understanding the timing and risk factors for neonatal hypocalcemia is crucial for timely intervention.
    • Appropriate calcium supplementation protocols should be based on the onset and duration of hypocalcemia.
    • Accurate diagnosis of hypocalcemia relies on measuring ionized calcium levels.