In the U.S. you can’t just order your own diagnostic labs. (I’d argue this is usually good and prevents Theranos level fuckery. Theranos was actually trying to get state laws changed in AZ so people could purchase testing as a retail item at Walgreens, but I digress)

the good news is, so long as the test is ordered by an MD, or in many cases a NP (nurse practitioner) or even a PA, with a legitimate reason or diagnosis, you can just walk into a regional clinic or hospital primary care center, get your blood drawn.