What test do you take to get your vitiamn d levels?

To measure vitamin D levels, you take a blood test called the 25-hydroxyvitamin D test (25(OH)D test). This test assesses the concentration of 25-hydroxyvitamin D in your bloodstream, which is the primary form of vitamin D circulating in the body. It helps determine if you have sufficient vitamin D levels, are deficient, or have excess amounts.