I would consider tests comprehensive if tests all major internal organs (kidney, liver, heart, spleen + common cancers depending on gender/age), you can come up with one after talking to a physician. Because I am based in India, I can only recommend India specific one, https://www.apollohospitals.com/preventive-health-care-check... are generally good.
If some or all of these are "no", it's not a comprehensive exam.
http://www.uspreventiveservicestaskforce.org/Page/Topic/reco...
You don't really have a doctor girlfriend, do you? :)
Start by NOT asking random people on the internet.
Ask your doctor about what tests to do and he'll tell you based on your age / history, and you can trust him better than a random stranger or some web post.
Law and Medicine are two of the things most likely to precipitate a lot of online commentary by people who don't have the first clue of what they're talking about.
If I met a community of strong critical thinkers about Chemistry or Civic Engineering I wouldn't ask them advice for my software stack.
Besides, with the exception of a 20% or less who knows what they're talking about (and those only for narrow Computer Science or Engineering fields each), the others might as well be on Reddit. You can find tons of uninformed opinion about anything here. Plus a huge tendency to go with the latest fads (Rails, then JS, then Go, then Rust, etc).
>Doctors aren't mythical beings
No, just trained professionals.