In a PRP treatment, what is the main difference between the clinics or doctor? The technique/technology is different?

Hi, and thank you for your question regarding PRP treatments. While PRP treatment devices do differ as well as the protocols of board-certified facial plastic surgeons who perform the surgery, choosing a surgeon who is qualified and experienced using PRP to treat hair loss will have the most impact on getting the results you want. Select a board-certified facial plastic surgeon who can show you before and after photos of prior patients and has a long track record of successful treatments. Take your time selecting your surgeon. While PRP treatments have minimal risks, you do not want to lose time or money or get less than optimal results from a surgeon with minimal experience or does not follow best practices. Good luck! - Elbert T. Cheng, MD

Great questions.
PRP Hair Regeneration is relatively new. Though proven effective for many it has not yet been definitively demonstrated that a specific treatment is better than another. However, there are undisputed common factors required in most successful treatments. They are:
1) The type of hair loss,
     Some types of hair loss do not respond well.
2) How long the condition exists in the treatment area,
     If you haven't seen hair in the treatment area for more than 5 years, it is likely you would not have benefit. Hair loss within the past 2 years stands the best chance of recovery. Any remaining hair in treatment area will benefit greatly.
3) Density of the PRP,
      Some PRP devices are better than others. There are now too many to list, but cost remain on the high side. Minimum blood draw is generally 50mL which yields about 7 mL of high density PRP. About 0.2mL is injected per square centimeter. Larger blood draws for more PRP are possible. If they claim more PRP was obtained than 1.5mL per 10mL of blood, it is very likely you're not receiving high density PRP.
4) Area covered with a given amount of PRP,
     The smaller more concentrated the treatment area for any given amount of PRP the better. 
5) Number and frequency of treatments,
     Generally, 4 to 6 initial treatments are required. Treatments are generally spread out over 4 to 6 week periods.
6) Many physicians add to the PRP to create a cocktail. 
     Extracellular matrix is very beneficial. Small amount of progesterone is known to be beneficial as well as a few other medications.
7) At home regimen is important. Many physicians have their own cocktail.  
 In regard to type of doctor; This is not a difficult procedure, nor is the diagnosis difficult to make. I do recommend a MD or DO assess you and perform the procedure. If they have a few years in aesthetics, you'll very likely be fine. Try to get someone with at least a year of hair regeneration.
The greatest concern you likely should have is getting to the root cause of your hair loss. I have seen very few hair specialist or aesthetic physicians do anything more than treat symptoms. You need to get to the root cause. Typically, Integrative Medicine, Functional Medicine and Anti-Aging physicians will be able to address the root issues.
When the root issues are properly addressed, your hair loss will likely stop, your PRP treatment will last longer to much longer and likely be more productive than without addressing the root issues. It is a very cost effective and healthier approach than simply getting PRP treatments which only treat symptoms.  
Wishing you the best,
Arbella Sarkis, MD