Urine AG = Urine (Na + K – Cl)
NOTE: In the setting of Bicarbonate loss, kidneys will retain Bicarbonate and excrete Ammonium (NH4). We do not measure NH4(+) directly; it is measured indirectly by measuring the negative ion (Chloride) it is secreted with to maintain electroneutrality (NH4Cl).
In the setting of non-anion gap metabolic acidosis:
1. Cho KC. Chapter 21. Electrolyte & Acid-Base Disorders. McPhee SJ, Papadakis MA, Rabow MW, eds. CURRENT Medical Diagnosis & Treatment 2012. New York: McGraw-Hill; 2012.
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