what is agap in blood test

The anion gap blood test is a way to check the acid-base balance (pH balance) of your blood and if the electrolytes in your blood are properly balanced. It measures the difference between positively and negatively charged ions in your blood. The normal range for anion gap is 4 to 12 mEq/L, although the normal level may vary by lab. A high anion gap test result may indicate metabolic acidosis, which means there is too much acid in your blood. The test requires a blood sample, which is drawn through a needle from a vein in your arm. There is no special preparation necessary for an anion gap blood test.