THE PLACENTAL-TRANSFER OF IGG SUBCLASSES IN HUMAN-PREGNANCY

  • 1 January 1980
    • journal article
    • research article
    • Vol. 41  (2) , 303-308
Abstract
Total IgG concentrations and the concentrations of the 4 subclasses of IgG were estimated in 34 pairs of maternal and fetal sera from pregnancies of various gestations ranging from 28-42 wk using the method of radial immunodiffusion. All subclasses of IgG cross the human placenta freely. Fetal levels of IgG and each subclass of IgG exceed maternal levels in full-term pregnancies. There was a close linear relationship between gestational age and the placental transfer of IgG and each of its subclasses.