A normal CO2 level keeps the blood acidity at the correct level. Abnormal levels of phosphorus, sodium or uric acid can also be caused by kidney problems. This is a waste product that is normally removed by the kidneys in the urine. High BUN levels can be due to a high-protein diet, dehydration, or kidney or heart failure. Creatinine is a waste product of protein digestion and a measure of kidney function.
High levels are usually due to kidney problems.
Doctors use the creatinine level as most direct sign of how well the kidneys are removing waste products from the body. Enzymes are proteins that cause or increase chemical reactions in living organisms. High enzyme levels can indicate liver damage caused by medications, alcohol, hepatitis, or recreational drug use. It is normally removed by the kidneys. High levels of uric acid are fairly common.