<prompt> Urinary anion gap is an indication of excretion of which of the following?KetoacidsNH4H ionK ion  <response>: Urinary anion gap is calculated using the equation, urinary anion gap Na K - Cl-. It reflects the ability of the kidney to excrete NH4Cl. During metabolic acidosis, kidneys normally eliminate NH4Cl- to enhance the removal of excess Hion. In response to acidosis, daily urinary excretion of NH4Cl can be increased from 30 mEq to 200 mEq. Ref: Harrisons Principle of Internal Medicine, 16th Edition, Page 368 ; Current Medical Diagnosis and Treatment 2012, Chapter 21 