Blood tests can be used to identify common causes or contributors to telogen effluvium.
Thyroid function – Low thyroid function can contribute to slow growing hair that sheds excessively. Thyroid hormone is necessary for the production of keratin protein within the hair matrix.
Zinc – Low levels of zinc are linked to a decrease in growth hormone and related growth factors. Zinc is also required for steriodogensis, and the inhibition of dihydrotestosterone (DHT).
B Vitamins | These vitamins are crucial for hair growth and normal metabolic cell function. Clinical trials prove links between low levels of B-complex vitamins are linked to hair loss.
Ferritin / Serum Iron / TIBC / Transferrin saturation – Iron deficiency contributes to hair loss and can be identified by serum ferritin, serum iron, and TIBC (total iron binding capacity). Low ferritin levels are diagnostic marker of an iron deficiency but high levels do nor confirm low iron availability in the body.
Vitamin D – Hair loss is associated with low levels of vitamin D and other fat-soluble vitamins. Vitamin D has emerged as the second most important nutrient (after iron) in healthy body functioning. Scalp biopsies in balding heads have shown that affected follicles have an increased level of vitamin D receptors on the cell membrane.
Cholesterol – Abnormal levels of cholesterol can contribute to hair loss. Research shows that. Cholesterol homeostasis affects to hair follicle biology and normal formation of the hair matrix.