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  • Title: Evaluating the clinical effectiveness of amniotic fluid assays in predicting respiratory distress syndrome in the neonate.
    Author: Amenta JS, Brocher SC, Serenko-Aber AL.
    Journal: Clin Chem; 1987 May; 33(5):647-52. PubMed ID: 3568348.
    Abstract:
    Amniotic fluid phospholipids from 346 patients' specimens were quantified and evaluated against the clinical outcome (i.e., respiratory distress syndrome or normal respiratory function). Concentrations of lecithin, sphingomyelin, phosphatidylglycerol, and the lecithin/sphingomyelin reflectance ratio were evaluated by ordered frequency distribution and stepwise discriminant function analysis. The lecithin/sphingomyelin ratio was the best single test for discriminating between respiratory distress syndrome and normal pulmonary function in the fetus, slightly superior to lecithin assay alone. A combination of lecithin/sphingomyelin ratio and lecithin concentration, however, appeared to optimize the discriminant function, although the clinical significance of this test combination remained marginal. High concentrations of phosphatidylglycerol were correlated with high concentrations of lecithin, and virtually ruled out respiratory distress syndrome. Absence of phosphatidylglycerol was not diagnostic. High concentrations of sphingomyelin increased the probability of respiratory distress syndrome. We suggest the following stepwise series of tests to optimize diagnosis: phosphatidylglycerol concentration, sphingomyelin concentration, and finally lecithin-sphingomyelin ratio.
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