Ueda H, Nakanishi A, Ichijo M
Tohoku J Exp Med. 1980 Sep;132(1):31-5. doi: 10.1620/tjem.132.31.
The following results were obtained by analyzing serum IgG, IgM and IgA of blood from the umbilical cord chiefly of small-for-date infants (term SFD infants): (1) The serum IgG level was higher in the infant's blood than in the mother's blood in the cases of appropriate-for-date infants (term AFD infants). Its fetus/ mother ratio was 1.25 +/- 0.22. (2) The fetus/mother ratios of IgG in term SFD infants and premature infants were lower than in term AFD infants. (3) The placental transmission of IgG increased as the gestation weeks went by, and its fetus/mother ratio reached 1.0 by the 38th week of pregnancy. (4) The serum IgM level was lower in term SFD infants than in term AFD infants. (5) Term SFD infants showed no difference of serum IgA level from that of term AFD infants.
通过分析主要来自小样儿（足月小样儿）脐带血中的血清IgG、IgM和IgA，得到以下结果：（1）在足月适于胎龄儿（足月适于胎龄儿）的情况下，婴儿血液中的血清IgG水平高于母亲血液中的血清IgG水平。其胎儿/母亲比值为1.25±0.22。（2）足月小样儿和早产儿的IgG胎儿/母亲比值低于足月适于胎龄儿。（3）IgG的胎盘转运随着孕周的增加而增加，到妊娠第38周时其胎儿/母亲比值达到1.0。（4）足月小样儿的血清IgM水平低于足月适于胎龄儿。（5）足月小样儿的血清IgA水平与足月适于胎龄儿的血清IgA水平无差异。
