Compare markers
Vitamin D vs calcium
Vitamin D and calcium are related to bone and mineral balance but measure different things.
General biomarker education — not personalized medical advice. Learn more
Vitamin D
Vitamin D blood tests usually report 25-hydroxyvitamin D, a common circulating form used in lab panels.
Calcium
Calcium supports bone, muscle, and nerve function and is reported on most metabolic panels.
Why both appear on reports
Laboratories may order vitamin D and calcium together when evaluating mineral or bone health.
When to discuss with your clinician
Ask whether supplementation or other conditions should be considered when reviewing these results.