女性体内高IgM水平与生殖期相符。

Experientia. 1980 Dec 15;36(12):1360-1. doi: 10.1007/BF01960097.

Quantitation of IgM in 875 individuals ranging in age from 2 to 95 years revealed that levels in females increased steadily until 15 years of age, remained high until 40, decreased during the forties and fifties and remained stable after 60. Levels in males remained stable after 2 years of age.

对年龄在2岁至95岁之间的875名个体的IgM进行定量分析发现，女性的IgM水平在15岁之前稳步上升，40岁之前一直保持在较高水平，在四五十岁时下降，60岁之后保持稳定。男性的IgM水平在2岁之后保持稳定。