Having hormones checked?

I was reading a post about a girl that has had stomach hair since 13 and ppl were suggesting that she get her hormone levels checked. I have had the same problem since I was around 13 also, also have a lot of hair on my arms and lower back. What would having your hormones checked do for it? How do you get them checked and how could there be a way to possibly change your hair on your body if your hormones are out of whack?