We don’t know that much about why some women get pregnant easily and others don’t. The causes of infertility are pretty mysterious. Age is considered the most common “cause” of infertility, but as we all know, there are young women who can’t get pregnant, and older women who have no trouble when trying to conceive.
As we get more information, it seems that there are often more subtle and specific things going on. New tests aim to pinpoint a specific woman’s likelihood of conception, or IVF success, by examining not just her age, but the interplay of a diverse range of factors, some of which have nothing to do with how old she is.
A new study has isolated one unexpected factor: blood type. Namely, Type O, which happens to be the most common type of all.
It turns out that women with type O blood are twice as likely to have elevated Follicular Stimulating Hormone, or FSH. High FSH levels are associated with low egg count and “ovarian failure”. O is the most common blood type for all races: almost half of asians and caucasians and more than half of blacks and hispanics have type O blood. This is the first study linking blood type to fertility, and it seems it’s too soon to draw too many conclusions from the study’s findings. It’s likely that the connection may have something to do with antigens in the blood, as presence or absence of antigens is a distinguishing factor in blood typing. More studies will certainly follow.
See more about the original study here.