6. A patient presents to the emergency room and has the following laboratory value: sodium 139 mEq/L, potassium 4.1 mEq/L, chloride 112 mEq/L, bicarbonate 15 mEq/L, blood urea nitrogen 24 mg/dL, creatinine 1.4 mg/dL and glucose 180 mg/dL. (10%) (A) What is the calculated anion gap and calculated osmolarity? b. Please list the possible etiologies that are responsible for the patient’s metabolic acidosis.