Other commonly used names are follicle-stimulating hormone , FSH , and urofollitrophin . FSH is primarily responsible for stimulating growth of the ovarian follicle, which includes the developing egg, the cells surrounding the egg that produce the hormones needed to support a pregnancy, and the fluid around the egg. However, the main function of LH is to cause ovulation. The sharp rise in the blood level of LH that triggers ovulation is sometimes called the LH surge.
Progesterone causes the endometrium to mature so that it can support the egg after it is fertilized.
If implantation of a fertilized egg does not occur, the levels of estrogen and progesterone decrease, the endometrium sloughs off, and menstruation occurs. It is given to simulate the natural LH surge. This results in predictable ovulation. Urofollitropin is to be given only by or under the supervision of your doctor. In deciding to use a medicine, the risks of receiving the medicine must be weighed against the good it will do.