RT Book, Section A1 Arora, Nayan A1 Jefferson, J. Ashley A2 Papadakis, Maxine A. A2 McPhee, Stephen J. A2 Rabow, Michael W. SR Print(0) ID 1175779925 T1 Normal Anion Gap Acidosis T2 Current Medical Diagnosis & Treatment 2021 YR 2021 FD 2021 PB McGraw-Hill Education PP New York, NY SN 9781260469868 LK accessmedicine.mhmedical.com/content.aspx?aid=1175779925 RD 2023/02/04 AB The two major causes are gastrointestinal HCO3– loss and defects in renal acidification (renal tubular acidosis) (Table 21–14). The urinary anion gap can differentiate between these causes.