TSH Blood Test
TSH Blood Test (thyroid-stimulating hormone or thyrotropin) - TSH is a hormone created in the pituitary gland, which in turn, regulates the thyroid gland. This blood test is used to diagnose thyroid problems, which can contribute to hair loss. See T-3 & T-4.
Of related interest, Dr. Shapiro has done a patient study connecting nutrition and hair loss. Please take a look at the related articles and research about the causes of hair loss, news reports, and an overview of nutrition and hair loss.