The number of PRP treatments required will be different for each patient and dependent on several factors. The amount of hair that has been lost and the area being treated will be the largest factors in determining how many treatments will be needed. Once treatments have started, the original estimate of expected treatments can change based on how the body responds to the treatment. Initial treatment of PRP will consist of multiple sessions spaced out over a period of several months. It is recommended to get the treatments in 4-6 week intervals with the number of sessions ranging anywhere from three to six, or more depending on the patient. Patients should expect to see results of PRP treatment by the four-month mark after their first session. If at that point, there are no noticeable results, PRP therapy may not have been the right treatment for your hair loss.