A patient is admitted to the critical care unit in congestive heart failure secondary to renal insufficiency.The patient reports that over the past few weeks, his urine output has decreased, and he has developed peripheral edema and ascites.A diagnosis of renal failure is made.The patient urinalysis has a specific gravity of 1.040.What could be the potential cause for this value?

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Specific gravity ranges from 1.003 to 1.030.Possible causes for increased values include volume deficit, glycosuria, proteinuria, and prerenal acute kidney injury (AKI).Possible causes for decreased values include volume overload and interrenal AKI.

A Patient Is Admitted to the Critical Care Unit in Congestive