Ballard Score — Newborn Gestational Age Maturational Assessment
The Ballard score (New Ballard Score, NBS) is a clinical assessment tool that estimates gestational age in newborns by evaluating neuromuscular and physical maturity criteria.
About
The Ballard Maturational Score, developed by Dr. Jeanne Ballard and colleagues in 1979 and revised in 1991, assesses gestational age from 20 to 44 weeks using 12 physical and neuromuscular criteria. Each criterion is scored from 0-4 or 0-5, with total scores ranging from -10 to 50. The score is particularly useful when maternal dates are uncertain, which occurs in up to 20% of pregnancies. The Ballard score is most accurate when performed within 12-96 hours of birth by an experienced examiner.
Formula
Total Score = Neuromuscular Score (posture, square window, arm recoil, popliteal angle, scarf sign, heel to ear) + Physical Score (skin, lanugo, plantar surface, breast, eye/ear, genitals). GA (weeks) derived from total score table.
Each of the 12 criteria is scored individually. The sum of neuromuscular scores (0-24) and physical scores (0-26) gives the total score, which maps to gestational age from 20 to 44 weeks.
Score Interpretation
Accurate gestational age assessment is essential for neonatal care decisions including resuscitation, feeding, medication dosing, and screening for prematurity-related complications. The Ballard score is particularly valuable when prenatal ultrasound dating is unavailable.
Ballard Total Score — 0+
Total score maps to 20-44 weeks gestational age.
Management: Confirm with early ultrasound if available.
Reference Ranges
| Population | Normal Range | Notes |
|---|---|---|
| Newborns 20-44 weeks GA | Score -10 to 50 maps to 20-44 weeks | Most accurate within 12-96 hours of birth |
Dr. Khaled Hassan
Dr. Khaled is a cardiology consultant with experience in acute cardiac care.
View medical review board & editorial policy →Example Calculation
A newborn with neuromuscular score 12 and physical score 14: total = 26. This corresponds to approximately 38 weeks gestational age. Category: Term (37-42 weeks).
Related Conditions
Common Mistakes
Performing Ballard scoring after 96 hours of age
Perform the assessment between 12-96 hours of age for best accuracy.
Frequently Asked Questions
What is the difference between Dubowitz and Ballard scores?
References
- Ballard JL, Khoury JC, Wedig K, et al. New Ballard Score, expanded to include extremely premature infants. J Pediatr. 1991;119(3):417-423. PubMed