ATI NCLEX-RN Practice Questions Practice Question
A client has had amniocentesis. One of the tests performed on the amniotic fluid is a lecithin/sphingomyelin (L/S) ratio. The results show a ratio of 1:1. This is indicative of:
Correct Answer: A
Rationale: At about 30-32 weeks' gestation, the amounts of the surfactants, lecithin, and sphingomyelin become equal. As the fetal lungs mature, the concentration of lecithin begins to exceed that of sphingomyelin. At 35 weeks, the L/S ratio is 2:1. Respiratory distress syndrome is unlikely if birth occurs at this time.
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