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.
Jurado R, Mattix H. The Decreased Serum Urea Nitrogen–Creatinine Ratio. Arch Intern Med. 1998;158(22):2509–2511. doi:10.1001/archinte.158.22.2509
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