Most women with pattern baldness have normal menstruation, normal fertility, and normal endocrine function, including correct levels of circulating androgens. Therefore, they would only need extensive hormonal testing when symptoms and signs of androgen excess become really visible.
Laboratory measurement of serum total or free testosterone, dehydroepiandrosterone sulfate and prolactin are appropriate when hirsutism, severe unresponsive cystic acne, virilization, or galactorrhoea are present. Measurement of serum thyrotropin, serum iron and ferritin, and complete blood count may eliminate common causes of hair loss.Differential Diagnosis of Androgenetic Alopecia.
Androgenetic alopecia in women can be confused with the former condition. This is in spite of the fact that features of chronic telogen effluvium are distinct. Anyway, horizontal sections of a scalp biopsy help to distinguish the two conditions once the ratio of terminal hairs shrinks.