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Background: This study’s aim was to determine whether diminished oocyte reserve (DOR) increases the risk of having a fetus with trisomy 13, 18, or 21 at 10 weeks as evaluated by non-invasive prenatal testing (NIPT) and to evaluate the confounding effect of advanced age. Methods: NIPT was undertaken in all pregnancies conceived through natural treatment or assisted reproductive technology that reached 10 weeks from conception with a viable fetus from one infertility center. Data were stratified according to serum anti-Mullerian hormone (AMH) < 1 ng/mL and ≥1 ng/mL. Results: No woman < 39 or with AMH ≥ 1 ng/mL showed trisomy 13, 18, or 21 by NIPT. Only women ≥ age 39 with DOR had one of these trisomies. Conclusions: Hopefully these data, coupled with other factors, e.g., etiology of infertility, age, insurance, or financial circumstances, and personal views of pregnancy termination, will aid patients with DOR when choosing treatment options, including natural conception, IVF-ET, IVF with pre-implantation genetic testing for aneuploidy, or transfer of fertilized donor eggs.