NCLEX Review Guide: Large for Gestational Age (LGA) Newborn

LGA Classification

• Large for Gestational Age (LGA) refers to newborns whose birth weight is above the 90th percentile for their gestational age, typically weighing more than 4000-4500 grams (8 lbs 13 oz to 9 lbs 15 oz).
• LGA newborns may appear plump, round-faced, and have excessive subcutaneous fat but may actually be physiologically immature for their size.

Maternal Risk Factors

• Maternal diabetes mellitus is the most common cause, leading to fetal hyperinsulinemia and excessive growth from increased glucose transfer across the placenta.
• Other factors include maternal obesity, previous history of LGA infant, prolonged pregnancy (>42 weeks), and maternal age >35 years.

Immediate Complications

1. Birth trauma - shoulder dystocia, brachial plexus injuries, clavicular fractures due to difficult delivery
2. Hypoglycemia - occurs within first 2-6 hours due to hyperinsulinemia and sudden loss of maternal glucose supply
3. Respiratory distress - delayed lung maturation despite size, increased risk of transient tachypnea
4. Hypocalcemia and hypomagnesemia due to metabolic imbalances

Priority Nursing Actions

1. Monitor blood glucose levels every 30 minutes for first 2 hours, then every 2-4 hours for 24 hours
2. Initiate early feeding within 30-60 minutes of birth to prevent hypoglycemia
3. Assess for birth injuries - examine clavicles, check arm movement, assess for Erb's palsy
4. Monitor respiratory status closely - assess for signs of respiratory distress syndrome
5. Support thermoregulation as LGA infants have increased surface area and heat loss

NCLEX Success Strategies

• Always prioritize airway, breathing, circulation - but remember glucose is critical for brain function in LGA infants
• Look for keywords: "diabetic mother," "large baby," "jittery," "poor feeding" = think hypoglycemia
• Remember: Size doesn't equal maturity - LGA babies can still have immature organ systems