<prompt> Plasma urea creatinine ratio of 20:1 may be seen in:RhabdomyolysisUreteric calculiPre-renal failureChronic Glomerulonephritis  <response>: Plasma ureacreatinine ratio of 20:1 is seen in renal azotemia. In renal failure both BUN and creatinine levels are elevated, and the ratio is elevated as filtered urea is reabsorbed and creatinine is excreted. Ref: CURRENT Diagnosis Treatmentchapter, Chapter 9; Advances in clinical chemistry, Volume 29 By Herbe E. Spiegel, Page 137; Nephrology in 30 Days By Robe F. Reilly, Mark A. Perazella, Page 234. 