Reference ranges
Calcium reference range
Reference ranges describe the interval a laboratory prints next to your result. They are not a diagnosis of what is “normal” for you personally — your clinician interprets results in context.
General biomarker education — not personalized medical advice. Learn more
What Calcium measures
Labs typically report total calcium in blood, which is influenced by bone, diet, vitamin D status, and other factors that a clinician can help interpret.
Why ranges differ
Laboratories set their own reference intervals using their methods, equipment, and population data. That is why the range on your Quest report may differ from a LabCorp report — always use the interval printed on your source document.
Common units
Calcium is often reported in mg/dL. Confirm units on your original report before comparing values across time.