Calcium

Measured in mg/dL

The total calcium in your blood — which reflects mineral and hormone regulation, not how much calcium is in your bones, and which shifts with your albumin level.

What it is

Calcium in blood is tightly controlled by hormones (mainly parathyroid hormone) and vitamin D, and it matters for nerves, muscles, and clotting. A standard test measures total calcium, but roughly half of it is bound to a protein called albumin — so if your albumin is low or high, total calcium can look low or high without the active ('free' or ionized) calcium actually being off. Because of that, clinicians read calcium alongside albumin and sometimes use an ionized calcium test or a correction calculation; it also says very little about your bone density, which is measured a different way.

Typical range

  • Adults8.6–10.2 mg/dL

Source · Mayo Clinic Laboratories (CA) — union of adult age bands (2026)

Reference ranges vary between laboratories, and what is normal for you depends on your own history. Your own lab’s range is the one printed on your report.

Worth asking your clinician

  • Given my albumin level, how should my total calcium be interpreted?
  • Would an ionized calcium test or looking at related markers add useful context here?
  • Is this result something to recheck, or does it look consistent with my past values?