Vitamin D is an essential nutrient that plays an important role in various bodily functions. It helps the body absorb and retain calcium and phosphorus, both of which are critical for building and maintaining strong, healthy bones. It also supports immune system function and reduces inflammation.

While primarily obtained through exposure to sunlight, vitamin D can also be acquired through dietary sources. Few foods are naturally rich in vitamin D, but some are fortified with the nutrient, including milk, orange juice, and breakfast cereals.

Vitamin D deficiency can result from poor dietary intake, insufficient sunlight exposure, and malabsorption issues. Deficiency can lead to osteoporosis, an irreversible condition in which bones become weak and brittle, and increased susceptibility to infections.

Who should take this test?

Vitamin D testing is recommended for individuals who are at a higher risk of deficiency, including older adults, people with limited sun exposure, individuals with darker skin, people with conditions that limit fat absorption (such as liver disease, cystic fibrosis, celiac disease, Crohn’s disease, and ulcerative colitis), and those with obesity or who have undergone gastric bypass surgery.

What is included in this test?

This blood test measures:

• 25-hydroxyvitamin D

25-hydroxyvitamin D is produced in the liver as a result of the initial metabolism of vitamin D obtained from dietary sources or synthesized in the skin when exposed to sunlight. Measuring the levels of 25-hydroxyvitamin D in the blood is a common and reliable way to assess a person's vitamin D status, as it reflects both dietary intake and sun exposure.

How will taking this test benefit me?

Adequate levels of vitamin D are essential for maintaining healthy bones and a strong immune system. A vitamin D blood test is an easy way to monitor your levels and ensure you maintain optimal well-being.