I don't like the "Dr" approach to a home, we have one in my area and personally I believe it's fraud meaning your saying you have a doctorate degree. I see plenty people get arrested for impersonating Drs, dentists etc.
With that said, from what I gather your work is top notch.
I would go with something like
Transplant Specialist- meaning they'll call you when they want something updated.
I only read couple these posts, but slogans/names intrigue me, it does take awhile to formulate in your mind what your business focuses on, but not to limit type of work should you want to expand and not be locked into a box because of the name etc.