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In page Hyperchloremia:

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Elevated levels of chloride in the blood can be tested simply by requesting a serum chloride test. A doctor would request this test if there are signs their patient is experiencing an imbalance in acid-base levels for a prolonged period of time.[1][2] For the test to occur a healthcare provider must draw a sample of blood from the patient. It is preferred that blood is drawn from the vein in the inner elbow or the back of the hand. The sample will then be sent to a laboratory and results will be provided to the patient's physician. As mentioned earlier a normal serum chloride range is from 96 to 106 mEq/L, and hyperchloremic patients will have levels above this range.[1]