Magnesium (Mg)

What Affects the Test

Reasons you may not be able to have the test or why the results may not be helpful include:

• Using medicines that contain magnesium. This includes many antacids, laxatives (such as milk of magnesia or Epsom salts), and magnesium supplements.
• Medicine. Some antibiotics, insulin, and long-term use of diuretics can lower magnesium levels.
• Recent intravenous (IV) fluids, such as fluids given during surgery.
• Pregnancy. Magnesium blood levels may normally be low in the second and third trimesters of pregnancy.

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Author:	Maria G. Essig, MS, ELS	Last Updated: April 17, 2008
Medical Review:	Kathleen Romito, MD - Family Medicine Brian D. O'Brien, MD - Internal Medicine
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