Just being a man in your twenties is reason enough to know why you’re having a hard way to go with ridding yourself of hair. Lab tests are ordered based on your symptoms. Are you having other symptoms, besides the difficulty of getting rid of the hair, that relate to your adrenal glands or your pituitary gland??? You and your physician would have to discuss and answer that question as that stuff is completely out of my realm!
In your case, I would guess that all the hair you have is simply related to your family history. Androgen production (male hormones) and having hair-follicles that are genetically sensitive to these circulating androgens is most likely the cause. Your just a man and this is what nature has designed for men.
All doctors are not equal in helping hairy people. They really aren’t trained to delve into such matters. So, you have to find some doctor that is interested in hair growth - a researcher-type would be good.
I can say as far as laboratory testing for the evaluation of hirsute women goes, the testing starts with an androgen profile. Clinically useful and readily available tests are free testosterone and dehydroepiandosterone sulfate ((DHEAS) . Had to look up the spelling on that one! There are other tests, too, that I won’t mention because they relate to hairy women.
I don’t know why laser didn’t work for you and I really am wondering what you hope to find out by testing. You’re a man and your body is behaving the way God and nature intended it to behave. Your body is probably recruiting new hair follicles as I’m writing this, being that you are so young. I wish you well.
Good luck Chuck,