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Blood tests are a standard diagnostic tool used to check the level of certain components and chemical compounds usually found in blood. Blood can also be tested for certain toxins and antibodies to certain diseases, as well as vitamin levels. Several blood tests are often done routinely, while others have to be targeted due to the need for special equipment or the fact that each test needs a certain amount of blood.

Some common tests are:

  • uric acid - an indication of proper kidney function.
  • sodium - an important component in the transmission of nerve impulses.
  • bilirubin - a by-product of the destruction of red blood cells and an indicator of proper liver function.

A chart of normal values for blood tests, via Wikipedia