Blood-work is very important that needs to be done while on gear-
Before and after cycle:
After cycle extra tests:
Echo-cardiogram: This doesn't have to be done all the time, but it should be done after the first cycle to evaluate how your heart reacts. Repeat after a year or two, or after using heavy equipment.
You should never use these substances if you have a heart enlargement or a myocardial infarction. In layman's terms, it indicates your heart can't take it anymore
After PCT you should get these tests done
LFT, KFT, Total Test, and Estrogen and Lipid Profile.
For HCG-based PCT users no need for LFT & KFT
If no issues with Clomid, Nolvadex, or AI, you can dismiss KFT, and LFT in the PCT stage after a few initial cycles.
That's why it's recommended to start with a modest testosterone-only cycle and then stack higher to understand your body's limits and reduce risk to a minimum.