Make sure you have copies of all testing done.
From everybody!
You are entitled to them and can give copies to future docs, or Mayo.
You can glean much from reading and researching the numbers given you
in the test results.
Start a file folder and demand your records, especially if you are
considering switching docs.
You'll know which tests have been done and which ones haven't.
See:
www.lizajane.org
for a complete list of tests for PN and a downloadable form
to follow your results, over time.