TB tests use phlegm — not the easiest thing to get or work with. It takes time for results. And there can be false negatives ...

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 ...

Any activity that creates dust should be investigated to see whether there is a risk of that dust being combustible. We've been blogging and writing a lot recently on the basics of combustible dust.

If you don't feel well, you may worry that you have COVID-19. The only way to know for sure is to take a test. At-home tests can tell whether you have the virus right now. More specialized antibody ...