A 6 week infant with ambiguous genitalia (as shown below) presents with an episode of dehydration & shock requiring hospitalization. What is the electrolyte abnormality that you expect in this baby?: (A) Hypokalemia, (B) Hyperkalemia, (C) Hypocalcemia, (D) Hypercalcemia
Answer is B. Ambiguous genitalia in an infant with dehydration & shock, suggests the diagnosis of CAH due to 21 hydroxylase deficiency; There is aldosterone and coisol deficiency leading to hypotension, hypoglycaemia, hyponatremia and hyperkalemia.