What is ovarian reserve and why is it an important part of infertility workup? Ovarian reserve is the capacity of the ovaries to produce oocytes or eggs. Ovarian reserve can be tested by doing simple tests like AMH, FSH and antral follicular count assessment by USG. Detecting low ovarian reserve early helps us to take early decisions in infertility treatment by resorting to Assisted reproductive techniques kike IUI or IVF.