Our Hair Loss Blood Test is an ideal profile to help find health issues that could be causing hair loss. This profile includes tests for testosterone, SHBG and the free androgen index to check for imbalances, TSH and T4 for thyroid health, and ferritin to investigate your iron status. There can be many different causes of hair loss, including age and genetics, which can lead to male or female pattern baldness and autoimmune conditions such as alopecia areata. Read more in our blog: six surprising causes of hair loss. On average, we have around 100,000 hair follicles on our heads and losing between 100-120 hairs per day is a normal, natural part of the hair’s growth cycle. However, for some people, the amount of hair they lose is much more than that and not understanding why can be worrying. Prepare for your Hair Loss Blood Test by following these instructions. Please take your sample before 10am. Take this test when any symptoms of short-term illness have settled. Do not take biotin supplements for two days before this test, discuss this with your doctor if it is prescribed.