Audio Qbank – Q190 – An 8F with a two-week Hx of confusion

An 8-year-old girl is brought to the GP because of a two-week history of confusion. Her history is significant for convalescence one month ago from pneumococcal meningitis. Serum studies show Na⁺ 112 mEq/L, K⁺ 4.5 mEq/L, plasma osmolality 260 mOsmol/kg. Which of the following sets of urine findings is most likely in this patient? (Proximal convoluted tubule – PCT; Juxtaglomerular apparatus – JGA; Medullary collecting duct – MCD)