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Clinical Observation
December 7/21, 1998

The Decreased Serum Urea Nitrogen–Creatinine Ratio

Author Affiliations

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.

Arch Intern Med. 1998;158(22):2509-2511. doi:10.1001/archinte.158.22.2509

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.