Blood tests for blood urea nitrogen (BUN) and creatinine can provide a wealth of information about your metabolism, kidney, liver, and general health. Although they can be utilised independently, the BUN/creatinine ratio can aid in identifying critical problems. The BUN/Creatinine ratio can be used to check for conditions like dehydration, kidney disease or injury, stomach bleeding, and other difficulties. The test provides a calculation of the glomerular filtration rate, which reflects how well the kidneys are filtering the blood. Creatinine is naturally produced as a result of the body’s process of supplying energy to muscles. The kidneys filter and remove creatinine from the blood. Typically the amount of creatinine generated is relatively constant, so changes in creatinine levels in the blood can be an indicator of abnormal kidney function. eGFR is estimated based on the level of creatinine in the blood using formulas.