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What does L/S stand for?

L/S stands for lecithin/sphingomyelin ration


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This is important when the fetus is below 35 to 36 weeks gestation, because the lungs may not be mature enough to sustain life. This is because the lungs are not producing enough surfactant. After birth, the infant will develop respiratory distress syndrome from hyaline membrane disease. The amniotic fluid can be analyzed by fluorescence polarization (fpol), for lecithin:sphingomyelin (LS) ration.