Telegraph: Scientists have discovered for the first time that a woman's blood group could influence her chances of getting pregnant.
Researchers who tested a group of women seeking fertility treatment found those with the blood type O appeared to have a lower egg count and poorer egg quality than others.
By contrast those with blood type A seemed to have more and better quality eggs.
The findings could lead to women with type O blood being advised to try for a baby earlier, but experts said much more research was needed before such a step was taken.
O and A are the two most common blood groups in the British population: some 44 per cent are type O and 42 per cent are type A.
The study of 560 women, whose average age was just under 35, found that those with blood type O were more likely to have higher levels of 'follicle stimulating hormone' (FSH) than those with type A.
Fertility experts regard a high FSH level as a key indicator of having a low egg count, which is known as "diminished ovarian reserve".
FSH is naturally produced by the body to stimulate the follicles in the ovaries which produce eggs.
As a woman's ovaries run out of eggs in her 30s and 40s, production is stepped up to encourage more follicles to be made.
The study found that women who were blood type O were twice as likely to have an FSH level above 10 - commonly regarded as the threshold between normal and raised levels - as those in any other blood group.
For complete story, go to: Telegraph
Read more stories in the news.