RT Book, Section A1 Arora, Nayan A1 Jefferson, J. Ashley A2 Papadakis, Maxine A. A2 McPhee, Stephen J. A2 Rabow, Michael W. A2 McQuaid, Kenneth R. SR Print(0) ID 1184182464 T1 Hyponatremia T2 Current Medical Diagnosis & Treatment 2022 YR 2022 FD 2022 PB McGraw-Hill Education PP New York, NY SN 9781264269389 LK accessmedicine.mhmedical.com/content.aspx?aid=1184182464 RD 2024/04/19 AB ESSENTIALS OF DIAGNOSISMust know volume status as well as serum and urine osmolality to determine etiology.Hyponatremia usually reflects excess water retention rather than sodium deficiency. The serum sodium concentration is not a measure of total body sodium.Hyponatremia in hospitalized patients commonly is caused by administration of hypotonic fluids.