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• W1996389622 abstract "The lecithin/sphingomyelin (L/S) ratio in amniotic fluid is widely used to predict the risk of respiratory-distress syndrome. However, the results are unreliable if the specimen is contaminated or obtained during a complicated pregnancy. We therefore compared the predictive value of the L/S ratio with that of the concentration of saturated phosphatidylcholine (SPC) in 322 amniotic-fluid samples, 75 per cent of which were contaminated or obtained during complicated pregnancies or both. A positive result is one that predicted the development of respiratory-distress syndrome, taken as an L/S ratio equal to or less than 2/1 or an SPC below 500 μg per deciliter. The respiratory-distress syndrome was correctly predicted in 25 of 45 cases (55.5 per cent) with L/S ratios equal to or less than 2/1, and in 35 of 42 cases (82 per cent) with SPC's less than 500 μg per deciliter. When L/S ratios were greater than 2/1, there were 13 of 277 (4.7 per cent) false negatives, and when SPC's were above 500 μg per deciliter, there were three of 280 (1.1 per cent) false negatives. We conclude that determination of SPC is both more specific and more sensitive as a predictor of the respiratory-distress syndrome than the techniques currently in use. (N Engl J Med 301:1013–1018, 1979)" @default.
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• W1996389622 date "1979-11-08" @default.
• W1996389622 modified "2023-10-17" @default.
• W1996389622 title "Saturated Phosphatidylcholine in Amniotic Fluid and Prediction of the Respiratory-Distress Syndrome" @default.
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• W1996389622 doi "https://doi.org/10.1056/nejm197911083011901" @default.
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