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New Test Predicts the Age
The biological clock is ticking: After
menopause a natural pregnancy is
By taking blood samples from 266 women, aged 20-49, who had been enrolled in the much larger Tehran Lipid and Glucose Study, Doctor Ramezani Tehrani, President of the Reproductive Endocrinology Department of the Endocrine Research Centre and a faculty member and Associate Professor of Shahid Beheshti University of Medical Sciences in Tehran, Iran, and her colleagues were able to measure the concentrations of a hormone that is produced by cells in women’s ovaries – anti-Mullerian Hormone (AMH).
AMH controls the development of follicles in the ovaries, from which oocytes (eggs) develop and it has been suggested that AMH could be used for measuring ovarian function. The researchers took two further blood samples at three yearly intervals, and they also collected information on the women’s socioeconomic background and reproductive history. In addition, the women had physical examinations every three years.
Tehrani said: “We developed a statistical model for estimating the age at menopause from a single measurement of AMH concentration in serum from blood samples. Using this model, we estimated mean average ages at menopause for women at different time points in their reproductive life span from varying levels of serum AMH concentration. We were able to show that there was a good level of agreement between ages at menopause estimated by our model and the actual age at menopause for a subgroup of 63 women who reached menopause during the study. The average difference between the predicted age at menopause using our model and the women’s actual age was only a third of a year and the maximum margin of error for our model was only three to four years.
“The results from our study could enable us to make a more realistic assessment of women's reproductive status many years before they reach menopause. For example, if a 20-year-old woman has a concentration of serum AMH of 2.8 ng/ml [nanograms per millilitre], we estimate that she will become menopausal between 35-38 years old. To the best of our knowledge this is the first prediction of age at menopause that has resulted from a population-based cohort study. We believe that our estimates of ages at menopause based on AMH levels are of sufficient validity to guide medical practitioners in their day-to-day practice, so that they can help women with their family planning.”
MEDICA.de; Source: European Society of Human Reproduction and Embryology