Prenatal and postnatal evaluation of differences of sex development: a user's guide for clinicians and families.

PURPOSE OF REVIEW Differences of sex development (DSD) are a group of chromosomal, gonadal, and anatomic conditions that are not often diagnosed during pregnancy. Families and clinicians need diagnostic guidance that supports all aspects of the care from the prenatal to postnatal period. RECENT FINDINGS Noninvasive prenatal screening (NIPS) is obtained by sampling cell-free fetal DNA in the mother's bloodstream in the first trimester. While its primary purpose is to screen for genetic aneuploidies, it is also used to determine the sex of the fetus. When screening ultrasound shows genital anatomy that is discordant with the sex determination by NIPS, a DSD workup is warranted. The use of this relatively new screening tool may result in a higher number of prenatal referrals than in the past. SUMMARY This review summarizes suggested prenatal counseling, neonatal management, and postnatal workup of the most common DSD diagnoses. All of these diagnoses are rare, but the common features that families face are addressed with particular emphasis on psychosocial support and a measured shared decision-making approach.