What should be emphasized, however, is that quantity of eggs does not automatically translate to quality of eggs. There can be a high ovarian reserve with poor egg quality. Conversely, a young woman may have a low ovarian supply due to genetic factors, but she may still have good quality eggs. Usually a woman’s age is combined with her estimated ovarian reserve to predict the quality of her eggs. Because there is not a medical test to determine egg quality, the only real test of egg quality is a live birth.

Women with adequate vitamin D levels, defined as above 20ng/ml, undergoing IVF were TWICE as likely to conceive as women with low vitamin D levels, defined as below 20ng/ml.