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There are various methods to confirm this disease. Basically it is a deficiency of a certain enzyme in the baby's adrenal gland. Most commonly 21 hydroxylase deficiency
. Either you can look for 17 hydroxy progesterone
levels in urine, if high indicates Adrenal hyperplasia
due to 21 hydroxylase deficiency. Even enzyme assays can be done to find out the deficient enzymes causing this disease.