Defining neonatal hypoglycaemia: a continuing debate

Area of Science:

• Neonatal Medicine
• Metabolic Adaptation
• Pediatric Endocrinology

Background:

• Neonatal hypoglycemia is a frequent metabolic challenge during the critical fetal-to-neonatal transition.
• Transient low blood glucose is common in healthy newborns, reflecting normal adaptation.
• Prolonged or recurrent hypoglycemia poses risks for neurological and developmental outcomes.

Purpose of the Study:

• To critically evaluate the evidence supporting the widely accepted definition of neonatal hypoglycemia (<2.6 mmol/l or 47 mg/dl).
• To identify knowledge gaps in defining neonatal hypoglycemia.
• To advocate for the use of an 'operational threshold' instead of a single cut-off value.

Main Methods:

• Critical appraisal of existing scientific literature and clinical guidelines.
• Review of studies examining blood glucose levels in neonatal populations.
• Analysis of the definition and diagnostic criteria for neonatal hypoglycemia.

Main Results:

• The current definition of neonatal hypoglycemia (<2.6 mmol/l or 47 mg/dl) lacks robust evidence for universal application.
• Significant variability exists in glucose homeostasis among newborns, challenging a one-size-fits-all diagnostic approach.
• The concept of an operational threshold, considering individual infant factors, is proposed as a more nuanced approach.

Conclusions:

• The strict numerical cut-off for neonatal hypoglycemia may not be universally applicable or clinically optimal.
• Further research is needed to establish evidence-based operational thresholds for managing neonatal hypoglycemia.
• A shift towards individualized assessment and management strategies is recommended over rigid diagnostic criteria.