Abstract: A non-invasive method to evaluate the reproductive function in female subjects is disclosed. The method disclosed herein provides assessing female reproductive function and ovarian response based on the number of CGG repeats and AGG interspersion number and pattern on each of the FMR1 gene alleles. Using a mathematical formula, it is possible to calculate an allelic score that differentiates those subjects with a better reproductive performance. This solution can thus be used routinely as a biomarker for predicting infertility or in the selection of ideal ovarian donor candidates.