Maryland has some obnoxious laws that leave Quest Diagnostics as the only blood lab that works with the companies that allow consumers to order bloodwork. And I only know of two such companies:

• Health-Tests Direct (though you'll need to confirm your tests are available when checking out)
• True Health Labs (if a page for an individual test doesn't show state-specific restrictions, you should be ok to order)

At the time of this writing (early 2017), even Life Extension, a company normally willing to send blood draw kits to restricted states, won't ship to Maryland. It might be worth re-checking with them periodically though, because they're often much cheaper than other providers.

If you're near the border of another state, it could be worth doing a price comparison with the providers mentioned on my individual test pages, since many of them only care about the state in which the blood is drawn.

There's also companies like ZRT Laboratory and Canary Club with mail-in kits for tests that can work from saliva, urine, or fingerprick blood.

That's all I'm aware of for Maryland. If I've missed anything, please let me know in the comments so I can improve the page.