PRP or Platelet Rich Plasma therapy for hair loss is a three-step medical treatment in which a person’s blood is drawn, processed, and then injected into the scalp. Some in the medical community think that PRP injections trigger natural hair growth and maintain it by increasing blood supply to the hair follicle and increasing the thickness of the hair shaft. Sometimes this approach is combined with other hair loss procedures and medicine. There hasn’t been enough research to prove if PRP is an effective hair loss treatment. However, PRP therapy has been in use since the 1980s. It’s been used for problems such as healing injured tendons, ligaments, and muscles. • Blood test. This might help uncover medical conditions that can cause hair loss. • Pull test. Your doctor gently pulls several dozen hairs to see how many come out. This helps determine the stage of the shedding process. • Scalp biopsy. Your doctor scrapes samples from the skin or a few hairs plucked from the scalp to examine the hair roots under a microscope. This can help determine whether an infection is causing hair loss. • Light microscopy. Your doctor uses a special instrument to examine hairs trimmed at their bases. Microscopy helps uncover possible disorders of the hair shaft.