Vitamin D tests involve taking a blood sample to measure the vitamin D levels in your bloodstream. There are two forms of vitamin D in the blood: 25-hydroxy vitamin D, or calcidiol, and 1,25-dihydroxy ...

At-home celiac tests come in two main types: antibody tests that i.d. certain proteins present in the blood of people with celiac disease, and genetic tests that detect certain variants. For accurate ...

At-home drug tests are urine or saliva tests that can identify if illegal or prescriptions drugs are present in your body. These tests are an alternative to going in person to a laboratory or other ...

We tested the best vitamin deficiency tests from LetsGetChecked, Everlywell, and LabCorp, and our testers found them easy to use and informative. Learn more about the best vitamin deficiency tests ...

Scientists blended one sample, split it, and shipped it out. What came back exposed a problem the whole industry shares.