SIADH = low specific gravity?
- 0Apr 16, '09 by NICUrn2B
So I know that with DI the specific gravity is low b/c the urine is dilute, but in SIADH, why is the specific gravity low when water is being retained? Is it because that water is being retained else where, blood, and not going through the kidney tubules? HELP!
I've read threads on here and researched online...
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- 1Apr 17, '09 by DaytoniteSpecific gravity is not low in SIADH. It is high. SIADH is not caused by decreased renal excretion of water. Serum sodium and osmolarity are reduced. The kidney continues to excrete sodium and urine specific gravity is elevated although urine volume is decreased or water is absorbed (page 92, Pathophysiology: The Biologic Basis for Disease in Adults and Children, third edition, by Kathryn L. McCance and Sue E. Heuther).