The best way to establish your vitamin D levels is to take a blood test. There are several forms of vitamin D, and popular opinion suggests that the best test to take is the 25(OH)D blood test, which stands for 25-hydroxyvitamin D. 1 You can take this test either at your doctor’s or purchase an in-home testing kit 2. Both ways produce accurate results. The test involves taking a small sample of your blood via a tiny prick on the finger, which is then analyzed in a laboratory to determine vitamin D levels.
Testing for vitamin D levels 3 has become more common and easy to do. For a time, the perception was that it was an expensive test that provided little or no definite proof for treatment. However, research4 has shown that early testing can help with deficiency diagnosis and treatment. Fortunately, testing for vitamin D levels has become more prevalent these days with an increasing number of practitioners regularly testing patients.
The effects of vitamin D deficiency can remain hidden for many years and it’s easy to miss them. The best approach is to test for vitamin D levels twice a year to get an accurate picture: once in the middle of winter and then again at the end of the summer.