FSH versus AMH: age-related relevance to ICSI results

BACKGROUND: Women’s fecundity is known to decrease with the increase in chronologic age. Several biomarkers of the ovarian reserve, including follicle stimulating hormone (FSH), anti Müllerian hormone (AMH), have been proposed as possible predictors for the response to controlled ovarian stimulation (COS). Although there are assumptions indicating that the relationship between age and ovarian reserve is highly variable and the potential different validity of ovarian reserve markers in women in different age groups remains to be demonstrated. The purpose of our study was evaluating FSH and AMH as potential predictors of response to controlled ovarian stimulation and prediction of intracytoplasmic sperm injection (ICSI) outcome according to age. This prospective study has been carried out on 218 women having ICSI cycles. Cases were divided into two groups, group 1 (n 148), their age < 35 years, and group 2 (n 70), their age ≥ 35 years. All women received antagonist protocol during their ICSI cycles. Basal FSH and AMH were measured and correlated to the number of follicles on the day of trigger, the number of oocytes retrieved, chemical, and clinical pregnancies. RESULTS: The fertilization rate in group 1 was 68.15%, while in group 2 was 77.82% (p = 0.003) while the implantation rate (number of gestational sacs observed at 6 weeks of pregnancy divided by the number of transferred embryos) was 18.95 and 11.98% in group 1 and group 2, respectively (p = 0.041). The clinical pregnancy rate among both groups was 38.51% in group 1, while 24.29% in group 2 (p = 0.038). Women who got pregnant among those aged < 35 years had significantly lower basal FSH (p < 0.001), while women who got pregnant among those aged ≥ 35 years had significantly higher AMH levels (p value < 0.001) and higher E2 levels on the day of trigger (p = 0.007). CONCLUSION: We found that below the age of 35 years, the chances of pregnancy are more correlated to FSH levels, while above the age of 35 years, AMH was a more relevant test.