I love the doctor thank you letters. The ones I found in my files were typed, well-written, said wonderful things about my charming demeanor, and most importantly the specialist described in detail back to the referring doctor what the condition was, the test results and the diagnosis and next steps. I have found that this is the best 1-2 page letter to use for records-based OPs - not the doctor scrawls of each visit - they don't want to read it and want a nice simple typed summary with a condition, diagnosis, pain documentation, etc....