Trusted-source health topic
Vitamin D
Vitamin D supports calcium balance and bone health, and blood testing can measure a form used to assess vitamin D status.
Why is this important?
Understanding the purpose and limits of laboratory information can support a more informed conversation with a qualified healthcare professional.
How laboratory testing relates
The reason for testing and interpretation of a result depend on health history and professional guidance. This page does not recommend supplementation or a target for an individual.
Before testing
Preparation is test-specific. Follow the instructions given for the exact test and contact the laboratory if fasting, timing, medicines, or specimen collection is unclear. Do not stop medicines unless a qualified professional tells you to.
Educationally related laboratory guides
These links explain related laboratory records. They are not recommendations to request or purchase a test.
Sources & further reading
- MedlinePlus, U.S. National Library of Medicine: Vitamin D Test
External authoritative patient reference · Verified 2026-08-10
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