Urea:Creatinine Ratio

Working out Urea:Creatinine easily

Divide the creatinine by 10, if the urea is higher than creatinine then think pre-renal cause.

Eg if creatinine was 123 umol/L and urea was 16.1mmol/L.
16.1 > 12.3 so consider pre-renal disease.

Pre-renal - something causes ↓ BP

• Vomiting
• Diarrhoea
• Diuretics
• Haemorrhage
• Burns
• Renal Artery Stenosis

Intrinsic - something within the kidney

• NSAIDS
• Nephrotoxins
• Glomerulonephritis
• Vascular

Post-renal

• Kidney stones
• Tumours
• Retroperitoneal fibrosis