Calcium (Ca) in Blood

Blood Calcium

What Affects the Test

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

• Drinking too much milk or using too much antacid, calcium salt, or calcium supplement.
• Taking medicines, such as diuretics, acetazolamide (Diamox), albuterol, estrogen, birth control pills, corticosteroids, and some medicines that control seizures.
• Taking too much vitamin D, lithium, laxatives, theophylline, or ASA.
• Having many blood transfusions in a short period of time.

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Author:	Jan Nissl, RN, BS	Last Updated: January 10, 2007
Medical Review:	Martin Gabica, MD - Family Medicine Adam Husney, MD - Family Medicine Philip Belitsky, MD, FRCSC - Urology
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