[Estimation of secretory immunoglobulin A in serum of pregnant women (author's transl)]

Secretory immunoglobulin A (S-IgA) was measured by means of radial immunodiffusion, according to Mancini, with a self-made antiserum to the secretory component being used together with a S-IgA standard. S-IgA serum concentrations went up with significance in the course of pregnancy, which was probably attributable to increased production of secretory protein in the breasts in preparation for lactation.