What is the reference range of serum calcium?

Updated: Apr 29, 2020
  • Author: Thomas E Green, DO, MPH, MMM, CPE, FACEP, FACOEP; Chief Editor: Romesh Khardori, MD, PhD, FACP  more...
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The reference range of serum calcium levels varies among laboratories but generally is 8.7-10.4 mg/dL, with somewhat higher levels present in children. Approximately 50% of calcium is bound to protein, primarily albumin, and the remaining 50% is ionized and is in physiologic active form. [7]

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