An L/S ratio of 3:1 indicates which statement about respiratory distress risk?

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Prepare for the Neonatal/Pediatric Specialist Test. Use flashcards and multiple-choice questions with hints and explanations. Ready yourself for the exam!

Multiple Choice

An L/S ratio of 3:1 indicates which statement about respiratory distress risk?

Explanation:
A high L/S ratio indicates fetal lung maturity. Lecithin (a key surfactant component) rises as the fetal lungs mature, while sphingomyelin stays relatively constant; the ratio therefore increases with gestational age. When the ratio reaches around 2:1 or higher, the risk of infant respiratory distress syndrome (IRDS) is markedly reduced. A ratio of 3:1 shows mature lungs and, consequently, a low incidence of IRDS. This finding points to better postnatal lung function rather than indicating prematurity or small-for-gestational-age status, which aren’t determined by this ratio.

A high L/S ratio indicates fetal lung maturity. Lecithin (a key surfactant component) rises as the fetal lungs mature, while sphingomyelin stays relatively constant; the ratio therefore increases with gestational age. When the ratio reaches around 2:1 or higher, the risk of infant respiratory distress syndrome (IRDS) is markedly reduced. A ratio of 3:1 shows mature lungs and, consequently, a low incidence of IRDS. This finding points to better postnatal lung function rather than indicating prematurity or small-for-gestational-age status, which aren’t determined by this ratio.

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