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1 :

Hint : 🫁 L/S ratio = surfactant check.

Correct Answers:

  • Lecithin/sphingomyelin (LIS) ratio of 2:1


Rationale :

🟢 The lecithin/sphingomyelin (L/S) ratio is a component of amniotic fluid testing used to assess fetal lung maturity, especially when early delivery is being considered.

🟢 A ratio of 2:1 or higher indicates that the fetal lungs have likely developed sufficient surfactant, which is essential for alveolar stability and effective gas exchange after birth.

🟢 Surfactant production increases significantly after 32–34 weeks gestation, and an L/S ratio of 2:1 typically corresponds to mature lungs by 35 weeks.

🟢 This is the most direct biochemical indicator of pulmonary maturity, which supports the safe timing of elective cesarean delivery when there's no labor onset.

🟢 Other findings, like a reactive NST or BPP score, assess fetal well-being but do not confirm surfactant sufficiency or pulmonary maturity.


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