Sometimes, readily available laboratory data can provide valuable hidden in
formation. Such is the case with the serum urea nitrogen-creatinine ratio.
Pa 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 dia
gnostic possibilities suggested by a decreased serum urea nitrogen-creatini
ne ratio (ie, <8). Several clinical circumstances can lead to a decreased s
erum urea nitrogen-creatinine ratio.