<prompt> A 10 years old boy is having polyuria, polydipsia. Laboratory data showed in meqL:Na - 154K - 4.5HCO3- - 22S. Osmolality - 295B. Urea-50Uric specific gravity - 1.005What is the diagnosis?Diabetes insipidusRenal tubular acidosisBartters syndromeRecurrent UTI  <response>: a. Diabetes insipidusRef: Nelsons 20e p 348-349, Ghai 8e p 501-519The given child in question has presented with clinical features: Polyuria, polydipsia. Lab data: Hypernatremia S. Na - 154meqL, Raised S. Osmolality S. Osmolality - 295, Raised B. Urea B. urea - 50, Normal K, HCO - 4.5, 22 respectively. The given clinical and laboratory features are compatible with a diagnosis of diabetes insipidus 