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Rafael Jurado, MD; Holly Mattix, MD

Arch Intern Med. 1998;158:2509-2511.

Sometimes, readily available laboratory data can provide valuable hidden information. Such is the case with the serum urea nitrogen–creatinine ratio. A normal ratio is 8:1 to 10:1. It is well known that an elevated ratio is seen in cases of prerenal or postrenal uremia. Less appreciated are the diagnostic possibilities suggested by a decreased serum urea nitrogen–creatinine ratio (ie, <8). Several clinical circumstances can lead to a decreased serum urea nitrogen–creatinine ratio.

From the Medical Service, Atlanta Veterans Affairs Medical Center (Dr Jurado) and the Department of Medicine, Emory University School of Medicine (Dr Mattix), Atlanta, Ga.

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