About this test
Vitamin D helps the body absorb calcium and keeps bones and muscles strong. The body makes it with the help of sunlight. Low levels are common and can cause bone pain, muscle weakness and tiredness. This test measures 25-hydroxy vitamin D, the usual marker of your vitamin D status.
Why it is done
- To look into bone or muscle pain and weakness.
- To check vitamin D status in people with limited sun exposure.
- To monitor vitamin D treatment, when advised.
Preparation
Fasting is not usually required. Tell us if you take vitamin D supplements.
This information is general and is not medical advice. Please speak to your doctor about your results and treatment.