Gestational Age (GA) Assessment
Accurate determination of gestational age is critical for classifying newborns as preterm, term, or post-term, and for anticipating associated morbidities.
1. The New Ballard Score
The New Ballard Score is the standard clinical tool, assessing 6 physical and 6 neuromuscular criteria. It is most accurate when performed within the first 24–48 hours of life.
| Assessment Domain | Key Findings in Preterm vs. Term |
|---|---|
| Neuromuscular | Preterm infants show hypotonia (e.g., posture, scarf sign, heel-to-ear). |
| Physical | Preterm infants have lanugo, translucent skin, flat areolae, and minimal breast tissue. |
2. High-Yield Clinical Pearls
- Maturity Indicators: As GA increases, skin thickness increases, vernix caseosa decreases, and plantar creases move from the anterior third to the entire sole.
- Limitations: The Ballard score may be inaccurate in the presence of birth asphyxia, neurological insults, or sedation, as these affect neuromuscular maturity.
- Classification:
- Preterm: <37 weeks
- Term: 37–42 weeks
- Post-term: >42 weeks
NEET PG Hint: Remember: The New Ballard Score extends the original Ballard Score to accurately assess extremely preterm infants (as low as 20 weeks of gestation). For more high-yield neonatology protocols and free medical questions, visit mymedschool.org.