<prompt> A female has the previous child with congenital adrenal hyperplasia. In the present pregnancy, steroid therapy should be startedAfter karyotyping and determination of sex of the babyAt the time of deliveryBefore conceptionAs soon as pregnancy is diagnosed  <response>: Recommendations for pregnancies.ar risk of CAH consists of administration of dexamethasone 20 mgkg. It started by 6 weeks of gestation, this ameliorates the virilization of the external genitalia in affected females chronic villus sampling is then performed to determine the sex and genotype of the fetus; therapy is continued only if the fetus is an affected female.As pregnancy is diagnosed by urine test at around 6-8 weeks, so it should be the answer. 