Chloride is a type of electrolyte. It works with other electrolytes such as potassium, sodium, and carbon dioxide (CO2). These substances help keep the proper balance of body fluids and maintain the body's acid-base balance.
This article is about the laboratory test used to measure the amount of chloride in the fluid portion (serum) of the blood.
Serum chloride test
A blood sample is needed. Most of the time blood is drawn from a vein located on the inside of the elbow or the back of the hand.
Many medicines can interfere with blood test results.
You may have this test if you have signs that your body's fluid level or acid-base balance is disturbed.
This test is most often ordered with other blood tests, such as a basic or comprehensive metabolic panel.
A typical normal range is 96 to 106 milliequivalents per liter (mEq/L) or 96 to 106 millimoles per liter (millimol/L).
Normal value ranges may vary slightly among different laboratories. Talk to your provider about the meaning of your specific test results.
The example above shows the common measurement range for results for these tests. Some laboratories use different measurements or may test different specimens.
A greater-than-normal level of chloride is called hyperchloremia. It may be due to:
A lower-than-normal level of chloride is called hypochloremia. It may be due to:
This test may also be done to help rule out or diagnose:
Delirium may also alter bicarbonate levels.
Adrogué HJ, Madias NE. Respiratory acidosis, respiratory alkalosis, and mixed disorders. In: Feehally J, Floege J, Tonelli M, Johnson RJ, eds. Comprehensive Clinical Nephrology. 6th ed. Philadelphia, PA: Elsevier; 2019:chap 14.
Giavarina D. Blood biochemistry: measuring major plasma electrolytes. In: Ronco C, Bellomo R, Kellum JA, Ricci Z, eds. Critical Care Nephrology. 3rd ed. Philadelphia, PA: Elsevier; 2019:chap 54.
Seifter JR. Acid-base disorders. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 110.
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.