A 1-month old baby present with frequent vomiting and failure to thrive. There are features of moderate dehydration. Blood sodium in 122 mEq/l and potassium is 6.1 mEq/l. The most likely diagnosis is?
Gitelman syndrome
Bater syndrome
21-hydroxylase deficiency
11-13 hydroxylase deficiency
Ans. is 'c' i.e., 21 hydroxylase deficiency Blood parameters indicate Hyponatremia and Hyperkalemia in this patient. All conditions other than 21 hydroxylase deficiency present with Hypokalemia.