DHCR7 and neurodevelopmental disorder: We would suggest that in new studies in the field of neurodevelopmental disorders and possible links with sterol abnormalities, all of the following (and possibly more) should be included in the “work‐up kit” in all individuals recruited for study: serum levels of cholesterol, 7‐ and 8 dehydrocholesterol, 25‐OH vitamin D, testosterone, estrogen, cortisol (although diurnal variation may be a particular aspect to consider here) and 7‐dehydrocholesterol reductase.