PSG1 and preeclampsia: In another study, the serum PSG-1 levels of 82 healthy pregnant women were compared to the levels seen in 37 women with preeclampsia, eight with fetuses small for gestational age (SGA), and 13 with fetuses with acute fetal distress in the 3rd trimester, revealing that serum PSG-1 levels were lower in women with complicated pregnancies (Silver et al., 1993).