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Phosphatidyl glycerol: lipoprotein present when fetal lungs are mature.
Phospholipids: Fat-containing phosphorous. The most important are lecithins and sphingomyelin, which are important in the maturation of fetal lungs before birth.
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, and/or for phosphatidyl glycerol (PG).
 See also: During pregnancy, Menstrual period, Due date, Intercourse, Membranes
  
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