Calcium Test
Most calcium is in bone. Blood levels reflect parathyroid, kidney, and vitamin D function.
What is Calcium?
Most calcium is in bone. Blood levels reflect parathyroid, kidney, and vitamin D function.
Calcium Reference Range
These are the typical adult reference ranges used by major US labs. Your report will include the specific range used by the lab that processed your sample.
| Population | Range |
|---|---|
| age 18+ | 8.60 – 10.3 mg/dL |
Reference ranges are educational. Always interpret your result with the specific range printed on your lab report and discuss anything outside the range with a clinician.
What your Calcium result may mean
Often reflects parathyroid issues, certain cancers, or excess vitamin D.
Can reflect vitamin D deficiency, kidney disease, or low albumin (which carries calcium).
Educational only — not a diagnosis. Many factors can influence a single result. Discuss anything that concerns you with a healthcare provider.
Sources
Frequently asked
No. TestWell's licensed physician network reviews and approves your order — usually within minutes. You can place an order online without an in-person visit or a referral from your own doctor.
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