Just a quick question about blood work and doctors,

So I've never really been a big fan of doctors and at the moment I'm not actually registered anywhere.

Now with my cycle coming in the next month I know I need to get a doctors and get some blood work done.

Now, do I straight up tell my doctor "Yo I'm on gear, what's my blood saying?" Or do I have to stretch the truth?

I'm from the UK by the way--don't know if this would make a difference.