Vitamin D
A blood test that checks the level of vitamin D in your blood.
Vitamin D
A blood test that checks the level of vitamin D in your blood.
Also known as
What it measures
- Total vitamin D, or vitamin D2 and D3 separately
Why a doctor may order it
Usually done if a provider thinks a bone or other condition could be caused by very low vitamin D. Routine vitamin D testing is not recommended for everyone — your provider can tell you whether it is right for you.
What it helps evaluate
It can help a doctor look into bone-related conditions or signs that may be linked to low vitamin D, such as bone pain or muscle weakness.
Preparation
No special preparation is needed. Tell your provider about all the medicines, vitamins and supplements you take, because they may affect results.
Fasting
No fasting is needed.
Important considerations
- Not everyone needs this test — it is usually ordered for a reason, not for everyone.
Discuss results with your doctor
Talk to a doctor about your symptoms and about what your results mean — a single result is not a diagnosis. See a doctor promptly for severe or worsening symptoms.