Impact of circulating levels of total and bioavailable serum vitamin D on pregnancy rate in egg donation recipients

Vitamin D insufficiency and deficiency are frequent conditions in our southern European infertile population. In contrast to previous studies, patients who are not vitamin D replete do not have a decreased chance of becoming pregnant with egg donation. Bioavailable 25-OH vitamin D, which is a better marker of the status than total 25-OH vitamin D, does not correlate with pregnancy rate in recipients of donated oocytes. Thus, at this stage, there is insufficient evidence to recommend vitamin D screening in patients undergoing egg donation.