Waste product tests are a group of blood tests that measure the levels of specific waste products in the blood. The testing may also involve urinalysis. Abnormal results can signal conditions such as diabetic nephropathy, a common complication of diabetes.

• To test kidney function when problems are suspected
  
  
• To monitor treatment of kidney disease
  
  
• To check kidney function before or while taking certain drugs
  
  
• To help detect or monitor heart conditions, which are also common complications of diabetes
  
  
• To assess dehydration

Testing of waste products can also suggest many other conditions, including gout, liver disease, malnutrition, muscle disorders, shock and urinary tract infection.

Patients may be instructed not to eat for four to eight hours before a waste product test. They may be ordered to reduce or stop taking some of their medications or vitamins because some substances can interfere with the results of the test. Patients are urged to be sure their physician has a list of all medications and supplements that are being taken.