<prompt>  A 2 year old child is being evaluated for persistent metabolic acidosis. Blood tests show Na 140 mEqI, K 3 mEqI, Ca2 8 mgdL, mg22 mgdL, phosphate 3 mgdl, pH 7.22, bicarbonate 16 mEqI and chloride 112 mEqI. The plasma anion gap is -9152225 