I'm planning to get a checkup as a gift for my parents, but I'm debating between a premium health checkup and a functional medicine test.

Should I go for the premium checkup if the goal is early detection of cancer or disease, or the functional medicine test if the goal is to improve physical condition and function?

I'm not sure which test I should get for them.

There are many places that offer health checkups, but where would be a good place for a functional medicine test?