Vitamin D Blood Test
A vitamin D test measures the amount of vitamin D in the bloodstream, which is essential for maintaining healthy bones and teeth. It also supports immune function, mental well-being as well as muscle performance.
Vitamin D refers to a fat-soluble vitamin, often called the "sunshine vitamin", since the body generates most of it through sun exposure. While certain foods also provide vitamin D, it is difficult to meet daily requirements through diet alone. These sources include:
- Oily fish (salmon, mackerel)
- Egg yolks
- Mushrooms
- Vitamin D-fortified foods
Why Get a Vitamin D Test?
Low vitamin D levels can be easily corrected with supplements before they lead to health issues. Therefore, blood testing may be recommended if you:
- Have a known bone disorder
- Struggle with calcium absorption
- Are at risk of deficiency due to limited sun exposure
What Does the Vitamin D Blood Test Involve?
Vitamin D blood test is usually performed like any other blood test. During the procedure, you will need to expose your left or right arm so the appropriate vein can be located. After that, a tourniquet is tied around your upper arm to make the veins bulge. A small needle will then be inserted into the vein, and a small sample of blood will be drawn into collection tubes.
Once the sample is taken, a plaster will be attached to the site and can be removed after a few minutes.
No special preparation (such as fasting) is required for this test. However, it is advisable to wear loose-fitting clothing for easy access to your arm.