Vitamin D insufficiency is a global concern, and research suggests that potentially half of all people in the world may have low levels of vitamin D in their blood, according to the Harvard School of Public Health. If you're concerned about your own vitamin D levels, a simple blood test can determine if you need to increase or scale back your vitamin D supplementation.
About Vitamin D
Vitamin D plays an essential part in a number of body processes, such as calcium absorption, modulation of cell growth, neuromuscular and immune function, bone growth, and bone health. Without adequate amounts of vitamin D in the body, your bones may become brittle and thin. Vitamin D also helps prevent rickets in children and osteomalacia and osteoporosis in adults. The best way to get vitamin D is from sunlight, though you can also provide your body with vitamin D through supplements or food, such as salmon and vitamin D fortified milk.
Vitamin D Blood Testing
The standard vitamin D blood test is called the 25-hydroxy vitamin D test. This test measures the active form of vitamin D in your body in nanograms per milliliter. Generally, results that fall within the normal range on a vitamin D blood test are between 30 and 74 nanograms per milliliter, however some laboratories may use a slightly different numerical scale. If you're unsure about whether your test results fall within the normal range, talk to your doctor. If your test results show a lack of vitamin D, your doctor may increase your vitamin D supplementation. If your results show higher than normal levels of vitamin D in your blood, your doctor may advise you to stop taking vitamin D supplements.
Before the Test
You don't have to stop taking vitamin D supplements for a few days prior to a blood test, though you should avoid eating for approximately four hours before the test. Once your blood has been drawn for the test, you may eat as soon as you wish. To avoid dizziness, bring a banana or other small snack with you to eat directly after the test is complete.
More Information
People who receive limited sun exposure, those with milk or lactose allergies, vegans and ovo-vegetarians may be more prone to vitamin D deficiencies. People experiencing kidney or digestive problems may also be susceptible to vitamin D deficiencies due to impaired vitamin absorption. If you suspect you may have a vitamin D deficiency, speak with your doctor about monitoring your vitamin D levels through periodic blood testing. If your test results indicate a deficiency, take all supplements as directed by your physician.
Member Comments