Oestradiol is a steroid hormone and the strongest of the three naturally-produced oestrogens. It has many functions but primarily acts to mature and maintain the female reproductive system.
Testosterone is the primary male sex hormone – it plays a huge role in the development of male reproductive tissues as well as promoting secondary characteristics such as muscle and bone mass, libido and growth of bodily hair.
Sex hormone binding globulin (SHBG) is a protein produced by the liver which binds to certain hormones including: testosterone, dihydrotestosterone and oestrogen. Levels of SHBG are altered by medications, disease, sex steroids and insulin.
A main protein made by the liver. A low level of albumin can indicate a problem with your liver or kidneys.
This is the amount of free testosterone which is not bound to proteins like sex hormone binding globulin (SHBG) and albumin.