I have never had gyno but I would believe that you would start having symptoms prior to actually getting gyno. Everyone is different and responds differently to test. I'm not sensitive to test at all, I run a split dose of 200mg a week and without AI my estradiol is around 15. But, I keep AI ready if something changes. However, getting labs is easy. Typically, if you go to a provider they will make you get labs every 3 months.
https://www.isarms.com/forums/threads/letsgetchecked-com-my-new-youtube-channel-sponsor.57449/
https://www.isarms.com/forums/threads/letsgetchecked-com-my-new-youtube-channel-sponsor.57449/