Renal bicarbonate handling and associated diagnostic values in RTA

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Renal bicarbonate handling and associated diagnostic values in RTA Renal bicarbonate handling and associated diagnostic values in RTA. Arrows represent bicarbonate handling by the kidney. Renal bicarbonate handling and associated diagnostic values in RTA. Arrows represent bicarbonate handling by the kidney. The thickness of the arrow represents the relative amount of bicarbonate filtered, reabsorbed, and excreted. The values for PRTA and DRTA are given when serum bicarbonate is relatively normal (left panel) as well as when it is low (right panel). [K], serum potassium concentration; UpH, urine pH; FEHCO3, fractional excretion of bicarbonate; UAG, urine anion gap. * Urinary citrate in PRTA is not well studied but is reported to be normal. Asghar Rastegar CJASN 2011;6:2516-2521 ©2011 by American Society of Nephrology