Neonatal Hypoglycemia

Risk Factors & Presentation

• Infant of Diabetic Mother (IDM)
• Large for Gestational Age (LGA) or Small for Gestational Age (SGA)
• Late preterm infant (34-36 6/7 weeks)
• Perinatal stress (ischemia, infection, hypothermia)
• Symptoms: tremors/jitteriness, lethargy, poor feeding, apnea, cyanosis, seizures (often asymptomatic)

Screening & Initial Workup

• Point of care (POC) glucose screening for at-risk infants (within 30-60 mins of life/post-first feed)
• Confirm POC glucose < 40-45 mg/dL with a stat serum/plasma glucose level (do not delay treatment while waiting)
• Further diagnostic workup (critical sample: insulin, cortisol, GH, ketones) if hypoglycemia is severe, persistent (> 48 hrs), or requires high glucose infusion rate (> 8-10 mg/kg/min)

Management Algorithm

• Asymptomatic & glucose 25-40 mg/dL (first 4 hrs): Feed / breastfeed. Recheck in 1 hr.
• Symptomatic OR glucose < 25 mg/dL (first 4 hrs) OR < 35 mg/dL (4-24 hrs): IV dextrose bolus (2 mL/kg of D10W) and start IV infusion (D10W at 80 mL/kg/day)
• Monitor glucose regularly until consistently > 45 mg/dL prior to feeds.
• Consider continuous glucose monitoring or endocrine consult for sustained refactory cases.

Endocrine & Metabolic Stability

• Dextrose gel (40%): Massage 200 mg/kg (0.5 mL/kg) thoroughly into buccal mucosa for initial asymptomatic hypoglycemia.
• D10W Bolus: Exactly 2 mL/kg (yields 200 mg/kg of glucose) over 1-3 minutes if symptomatic.
• Glucose infusion rate (GIR) calculation: GIR (mg/kg/min) = (IV Rate [mL/hr] × Dextrose %) / (Weight [kg] × 6).
• Monitor for rebound hypoglycemia 30-60 minutes after discontinuing or weaning IV dextrose.
• Hold oral feeds if respiratory rate > 70 to prevent aspiration while hypoglycemic.

Standardized Discharge & Follow-Up Criteria

• Adequate weight gain explicitly > 15-30g/day over a continuous 3-5 day period.
• Maintenance of temperature in an open crib with standard clothing for 48 hours.
• Successful completion of the 90-120 minute Infant Car Seat Challenge.
• Caregiver successfully completed CPR training, rooming-in, and independent medication administration.
• Referrals placed for High-Risk Infant Follow-Up Clinic, Early Intervention (PT/OT), and appropriate sub-specialists.

Diagnostic & Management Algorithm

• Hypoglycemia Algorithm: [START] Point of Care Glucose < 45 -> [DECISION] Symptomatic? -> [YES] IV Dextrose bolus (2mL/kg D10) -> [NO] Feed & recheck -> [EVALUATE] If still < 45, start IV Dextrose infusion

References

1. Committee on Fetus and Newborn, Adamkin DH. Postnatal glucose homeostasis in late-preterm and term infants. Pediatrics.
2. Thornton PS, Stanley CA, De Leon DD, et al. Recommendations from the Pediatric Endocrine Society for Evaluation and Management of Persistent Hypoglycemia in Neonates, Infants, and Children. J Pediatr.