Using a blood spot test to measure the amount of vitamin D in your blood is an accurate way to discover if you are getting enough vitamin D. The blood spot test from ZRT Laboratory is called a 25(OH)D test.

ZRT Laboratory, in partnership with the Vitamin D Council, offers an at-home 25(OH)D blood spot test. The test is simple and convenient. Most importantly, the results are extremely accurate and will tell you if you’re getting enough vitamin D.