Lords Cratin Drops (30ml)Lords Cratin Drops The kidneys maintain the blood creatinine in a normal range. Creatinine has been found to be a fairly reliable indicator of kidney function. Elevated creatinine level signifies impaired kidney function or kidney disease. Generally, a high blood urea nitrogen level means your kidneys aren't working well. But elevated blood urea nitrogen can also be due to urinary tract obstruction. Products like urea & creatinine in blood is called