Follicle Stimulating Hormone (FSH)
Follicle stimulating hormone (FSH) is a reproductive hormone produced by the pituitary gland. It is essential in releasing eggs among women and making sperm among men. Having too much or too little of this chemical can make it difficult to get pregnant. Physicians order FSH tests to patients who have irregular periods, low sperm count, early or late puberty, pituitary or hypothalamus disorders, and difficulties getting pregnant.