Purpose: Mutations in the BRCA1/2 genes are associated with breast and ovarian cancer susceptibility. Recent studies have suggested that the BRCA mutation might be associated with occult primary ovarian insufficiency. To evaluate fertility, several studies have validated anti-Mullerian hormone (AMH) as a direct biomarker for ovarian aging and it is considered a quantitative marker of ovarian reserve. We hypothesize that BRCA1 gene mutations will be negatively associated with AMH levels. Methods: We evaluated 124 women aged 18-45 years participating in the Northwestern Ovarian Cancer Early Detection and Prevention Program. Patients with a history of cancer, ovarian surgery, or exposure to chemotherapy were excluded. Linear and logistic regression modeling were performed to evaluate the association between AMH levels, age, and BRCA1 mutation. In logistic models, the outcome low AMH' was defined as AMH35 years had 10 times the odds of a low AMH (35, BRCA1 was still strongly associated with a low AMH (p=0.037). Conclusion: Women >35 with the BRCA1 mutation have a lower AMH, and hence ovarian reserve, than women without a BRCA mutation. Therefore, young adults with the BRCA1 mutation should be counseled regarding this potential decrease in ovarian reserve.