LH

Distinguish egg maturation from egg release: FSH causes maturation; LH triggers ovulation.

Name the hormone's source as well as its effect when asked: the pituitary gland produces FSH and LH; the ovaries produce oestrogen and progesterone.

For an IVF description, give the stages in order: FSH and LH → several mature eggs → egg collection → fertilisation in the laboratory → embryo development → transfer of one or two embryos into the uterus.