What would be the immediate effect of a lack of luteinizing hormone?

Hormone imbalance. Lh is responsible for ovulation in women, as well as production of testosterone in both women and men. If it is suppressed, it usually means the hypothalamus is dysfunctional such as in long distance runners. There are many causes for hypothalamic dysfunction which can lead to hypogonadism (reduction in hormone production in the ovary or testicle).