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Background: The measurement of circulating anti-Mullerian hormone (AMH) in the plasma of adult women has been used as a tool in the assessment of ovarian reserve. This is based on its ability to reflect the number of growing follicles in the ovaries and knowing the level of AMH in a woman’s blood is generally a good indicator of her ovarian reserve and this can be achieved by making reference to a decision values. Objective: The purpose of this study was to measure the level of this hormone in normal, apparently healthy subjects in Rivers State, Nigeria with respect to age. The percentage of women, at their reproductive age with infertility problems in the state is in the increase and the essence was to establish a reference range for the hormone because of its clinical application in women fertility. Materials/method: A total of one thousand and sixty two apparently healthy women divided into four age groups were recruited for this study; this comprised of 300 each in age group of 20 - 30, 31 - 40, 41 - 50 respectively and 162 in 51 - 60 years age group from May 2014 to June 2017. They were randomly selected after filling a questionnaire form that has the information of age, tribe, last date of menses and whether on medication for any infertility problems. Excluded from the study were subjects identified with different endocrine dysfunction and/or on drugs for different types of anovulatory dysfunction. The Enzyme linked Immunoassay method was used in the measurement of the AMH. Results: The result from the measurement of plasma AMH levels showed a Mean ± SD value of 3.193 ± 0.943, 1.644 ± 0.691, 0.516 ± 0.276 and 0.135 ± 0.081 ng/ml respectively for the 1st, 2nd, 3rd and 4th age groups respectively. The mean value for the AMH decreases with increasing age and was statistically significant at the different age group levels (P < 0.05). The distribution pattern of the AMH, showed that a greater percentage of the women, about 46%, in age group 41 - 50 and 51 - 60 had a significant reduced level of the hormone from the group mean value, when compared with age group 20 - 30 and 31 - 40 years with about 15%. Conclusion: The reference, established range for the AMH (that is, 95% prediction interval), with respect to age in Rivers State women of Niger Delta region, Nigeria is as follows: −2.250 - 4.136; 0.953 - 2.350; 0.240 - 0.792 and 0.054 - 0.216 respectively for the age groups. This study summarizes the findings concerning AMH and its role as a marker for the quantitative aspect of ovarian reserve, ovarian aging, as well as ovarian dysfunction in this region of the country.

Anti-Mullerian Hormone: Establishing the Ovarian Reserve Range with Age in Rivers State Women, Niger Delta Region of Nigeria