Ideally, we should have had a full hormone panel done when we were in our mid 20's (assuming you are natural). Then you can compare/monitor the change (if any) in test, lh, fsh, shgb, T3,4, estrodiol, etc. etc. over the years, and when/if levels significantly changed compared to that first reading, then its time to see a specialist.
As for the specialist you need to see a urologist who specializes in male reproductive system and hormone replacement therapy. You can talk to the Dr. and find out whats best for you. For example:
My test levels are on the low side (approx 400) and my uro said I could go on TRT if I so choose. After speaking with him, however, we decided it was not time. I want children, and going on TRT would have a negative impact on the ability to do so (more so than the damage I caused in my early 20's using).
This is the urologist I spoke with:
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There's always online clinics. Dr. Life is an Uncle of one of my former clients and now close friend.
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Br