We had the diagnosis before I started with the LLM. The radiology showed the problem and the surgeries worked. Down to an ultrasound a year now!
We took him to our local ER, they ran tests. I gave the LLM just the symptom list that I gave to the ER initially. It replied with all the things they tested for. I gave the test results, and it suggested a short list with diagnostics that included his actual Dx and the correct way to test for it.