Anion Gap

Alternate Names

  • R Factor

AG is a blood test that measures the difference between the positive and negative charges of chemicals normally found in the blood which affects the blood pH (acidity). A deviation from normal levels is mainly used to diagnose ketoacidosis; and to also diagnose kidney failure, toxic levels of the medication lithium, or multiple myeloma.

There are many medications that will affect AG test results, and results will vary depending upon the lab performing the test.


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