Antenatal Steroid Benefit Gestational Age Window

Antenatal corticosteroids reduce neonatal morbidity and mortality when given for threatened preterm birth. Strongest benefit: 24–34 weeks. Benefit at 34–36+6 weeks (late preterm): reduces RDS and NICU admission. Periviable (22–23 weeks): consider with neonatal team. No benefit at ≥37 weeks. Administer both doses before delivery for maximum effect.