In medicine, the<unk> , also<unk><unk>  ratio,<unk><unk>  ratio or<unk> :Cr, is the ratio of two serum laboratory values, the blood urea nitrogen <unk>  and serum<unk> .  This terminology is used in the United States.  In Canada and Europe, urea is used instead of<unk> , so it is termed the urea-to-creatinine ratio, urea-creatinine ratio or urea/creatinine ratio.  The interpretation and significance of the ratio is identical.
BUN-to-creatinine ratio
Microalbuminuria
Creatinine clearance
Creatinine
Blood urea nitrogen
Uric acid
Serum-ascites albumin gradient
Glomerular filtration rate