That’s a discussion to have with your primary-care physician: if you eat a healthy diet and feel fine, there’s little reason to get tested. However, for some people with genetic conditions or who live in northern climes, testing for specific nutrient deficiencies-like vitamin D-may make sense.
Some tests that screen for a wide range of nutrient deficiencies include: Spectra Cell, Walk-In-Lab and Nutritionally Yours. If vitamin D is a specific concern, you can ask your doctor about the test offered by the Vitamin D Council (though the other screens can do individual nutrient testing as well).
You order the test through your doctor-or a nearby lab that offers the tests-and have your blood drawn there. Or you can order a kit through the mail and then go to a local clinic to have the blood drawn; some tests offer a finger-prick device to collect the blood at home.
The results will indicate whether your levels are adequate or deficient, and the lab may offer recommendations for making up any shortfalls. Always discuss a plan of action with your doctor first to make sure you don’t overdo it or take something that might interfere with your other medications.