How does syndrome of inappropriate antidiuretic hormone secretion (SIADH) affect blood urea nitrogen (BUN) levels?

Updated: Aug 16, 2019
  • Author: Christie P Thomas, MBBS, FRCP, FASN, FAHA; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Answer

Blood urea nitrogen (BUN) levels are unusually low, usually below 10 mg/dL. A low BUN level in SIADH occurs secondary to volume expansion because urea is distributed in total body water.


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