Pituitary not instructing testicles to produce Testosterone due to exogenous use.
A return to normal levels after ceasing PIED indicates testicles are being instructed to produce Testosterone again.
This test measures the level of follicle stimulating hormone (FSH) in your blood. FSH is made in the pituitary gland and plays an important role in sexual development and function. The test is used to assess fertility and pituitary disorders in men and women.
In women, FSH helps control the menstrual cycle and the production of eggs by the ovaries. Its level varies throughout the menstrual cycle and is highest just before ovulation when an egg is released. This is known as ovulation. FSH testing is used to investigate irregular menstrual periods or confirm menopause.
In men, FSH stimulates testicular growth and helps create and maintain normal sperm count. The test is used to find out if there is a problem with the testicles or what may be the cause of a low sperm count. It is also often used to investigate early or delayed puberty.