Urea Nitrogen: A chemical in the blood produced by the breakdown of protein. Urea nitrogen is removed from the blood by the kidneys. Blood Urea Nitrogen (BUN) tests are sometimes done to see how well the kidneys are working.

Uric Acid: A waste product left over from normal chemical processes in the body and found in the urine and blood. Abnormal buildup of uric acid in the body may cause a condition called gout. Increased levels of uric acid in the blood and urine can be a side effect of Chemotherapy or Radiation Therapy.
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