I go down to my HRT dose 4 weeks out and test fine, but if you're running tren, proviron, masteron, dbol, or eq (there may be others, but I know these for sure) your free test will come back way too high even if your total is in range. Deca, NPP, turinabol, and anavar don't bother mine so thats what I use from 4 weeks out of my blood work. I got my dose knocked down on EQ and Tren from 200 a week to 300 every other week.