early and urgent chromosomal analysis to determine the genotypic sex
measurement of urinary steroids and serum 17 hydroxyprogesterone to detect congenital adrenal hyperplasia; in classical 21 dehydroxylase the 17 hydroxyprogesterone will be raised
a serum sodium and other electolytes are important to exlude a salt-wasting congenital adrenal hyperplasia
pelvic ultrasound to assess the internal organs - specifically the presence or absence of a uterus, but also the location of the gonads
LH and testosterone levels - high with androgen insensitivity
laparoscopy may be required for biopsy of gonads found on ultrasound
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