I’m 20, female and have significant hair loss

First, check with your mom and the other females in the family (grandmothers, aunts, sisters, etc..) and see if they had the same situation in their 20s as this condition is often inherited on the female side of the family. You need to get a good doctor and a good examination of your hair with a trichoscope which shows classic genetic patterns in the area around the sides and back of your head.

Some common blood tests for female hair loss:

• Sex Hormone tests
• SHBG (Sex Hormone Binding Globulin) used to test status of male hormones
• Estradiol is a sex hormone
• FSH (Follicle Stimulating Hormone) *not hair follicle but follicle in the ovary*
• LH (Luteinizing Hormone) is a sex hormone
• Free Testosterone
• Total Testosterone
• ANA (Anti Nuclear Antibody) used to test for Lupus or other autoimmune diseases
• TSH (Thyroid Stimulating Hormone) used to test for hyper or hypo-thyroid disease
• Test Iron status
• TIBC (Total Iron Binding Capacity)
• Ferritin
• Iron

As these test may point to a cause other than genetic