Hi there,
Well hair loss may occur through several conditions, however the only form related to testosterone levels is known as androgenetic alopecia.
It is a hereditary disorder characterized by thinning of scalp hair, androgenetic alopecia occurs in both men and women through an androgen mediated mechanism. While this syndrome is technically a low testosterone state, in fact the body experiences high androgen levels due to the mechanism of dihydrotestosterone (DHT), a metabolite of testosterone with potent androgenic effects.