AUTHOR=Jiao Xue , Meng Tingting , Zhai Yiwei , Zhao Lijuan , Luo Wei , Liu Peihao , Qin Yingying TITLE=Ovarian Reserve Markers in Premature Ovarian Insufficiency: Within Different Clinical Stages and Different Etiologies JOURNAL=Frontiers in Endocrinology VOLUME=Volume 12 - 2021 YEAR=2021 URL=https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2021.601752 DOI=10.3389/fendo.2021.601752 ISSN=1664-2392 ABSTRACT=Objective: To characterize the ovarian reserve indicators for premature ovarian insufficiency (POI) at different disease stages and with various etiologies. Methods: According to different FSH levels and menstrual conditions, patients with normal ovarian reserve (NOR with 5 IU/L