Are there any causes of high SHBG or is it just genetic? I heard it is rare for young guys to have high SHBG. I have high SHBG and I am only 26 and I have decent total testosterone levels usually anywhere from 600-800 but SHBG is always at top the top of reference range or a little higher. Can SHBG just randomly creep out of nowhere and lower your free testosterone or is just my total testosterone is getting lower over the years? Either way I don't think there is anyway around this but for me to go on TRT at a young age. Everytime I use the free testosterone calculator I am less than 2% free. more like 1.5% for me.