Learn about the Calcium Blood Test, its purpose, normal range, and what abnormal levels may indicate. Understand how this test helps monitor bone health, parathyroid function, and overall wellbeing. Know all about healthy calcium levels, understand the difference in symptoms, and normal levels. Learn how to maintain healthy calcium levels and what to do and handle abnormal calcium levels. Discover the role of serum calcium levels in bone health, parathyroid function, and more. Learn about calcium blood tests, normal ranges, and symptoms of abnormal levels. A calcium blood test measures the total calcium level in your bloodstream, which includes both bound and unbound calcium. A normal blood calcium level is between 8.5 and 10.5 mg/dL, but levels can vary slightly with age.