I am experiencing thinking of hairs and excessive hair loss, very less hairs are left (this problem is from 3 years). Also, a condition of male pattern baldness is observed. I have very less, more precisely no exposure to sun (for vitamin D), I think I am vitamin D deficit. And I came to know, this can also lead to hair fall. Now, I am thinking to go for blood tests to diagnose root cause of this problem, kindly suggest me all the tests required for my condition? Also, suggest me the way I can stop hair fall and save the remaining hairs!