新浪尚文

　　一项美国调查声称，O型血女性随着年龄的增加在生育方面可能会遇到更多的问题。这是首个称女性的血型可以影响她怀孕机率的研究。

　　研究人员对一组寻求不孕治疗妇女进行检查时发现，与其他血型的女性相比，O型血的女性看上去排卵数量更少，卵子质量也更差。相比之下，A型血妇女排卵数量更多，卵子质量更好。这一发现可能导致O型血女性应尽早怀孕的建议，但专家们称，需要进行更多的研究才能提出这样的建议。

　　O型血和A型血是英国人口最常见的两种血型，英国人口中有44%是O型血，42%是A型血。

　　研究的首席作者、纽约艾伯特爱因斯坦医学院妇产科爱德华-尼加特博士称，他的调查结论是基于在耶鲁大学试管婴儿项目和孟特菲尔医疗中心接受不孕治疗的妇女之上。尼加特将于明天在丹佛召开的美国生殖医学年会上宣布他的发现。

　　研究对560名妇女进行了调查，她们的平均年龄在35岁以下。检查发现，O型血妇女的卵泡刺激素水平比A型血妇女更高。生育专家认为，卵泡刺激素水平高是卵子数量少的一个关键指标。身体产生卵泡刺激素以刺激卵巢里的卵泡(它可以产生卵子。)当三四十岁妇女的卵巢中卵子耗尽时，其身体就会自动产生更多的卵泡刺激素，以刺激排卵。因此，卵泡刺激素高水平意味着卵子数量变少。

　　研究发现，O型血妇女卵泡刺激素水平超过10(被认为是正常值和高值的分水岭)的可能性是其它血型妇女的两倍。

　　Blood type O may be barrier to having baby

　　Women with blood type O could have more trouble conceiving as they age, an American survey claims。

　　The study is the first to suggest 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 more research was needed before such a step was taken。

　　The blood groups O and A are the two most common in the British population: some 44 per cent are type O and 42 per cent are type A。

　　The lead author, Dr Edward Nejat, of the department of obstetrics and gynaecology at the Albert Einstein College of Medicine in New York, said his findings were based on women having fertility treatment at the Yale University IVF programme and the Montefiore Institute in New York。

　　He is presenting his findings tomorrow at the annual American Society for Reproductive Medicine (ASRM) conference in Denver。

　　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. FSH is produced by the body to stimulate the follicles in the ovaries that produce eggs。

　　As a woman's ovaries run out of eggs in her 30s and 40s, production therefore has to be stepped up to encourage more eggs. The presence of high levels of FSH indicates lower numbers of eggs。

　　The study found that women with blood type O were twice as likely to have an FSH level above 10 – regarded as the threshold between normal and raised levels – as those in any other blood group。

　　People with blood group A carry the A antigen, a protein on the cell surface, that is absent in people with O type。

　　Dr Nejat said: "Those with blood type O were twice as likely to have an FSH level over 10 than those with blood types other than O. We found that women with the A blood group gene were protected from this effect."

　　Susan Seenan, of Infertility Network UK, welcomed the study. "Anything that might help couples avoid having fertility treatment has got to be good news," she said。

　　Tony Rutherford, the chairman of the British Fertility Society, said the research was "interesting"。

　　But he said a study needed to be carried out among the general population, not just those who had gone for help with fertility problems。

　　(每日电讯报)

　　(解雨)