The Academic Autism Spectrum Partnership in Research and Education (AASPIRE) has some great tools for help autistic adults and their primary care providers at autismandhealth.org. They have a Autism Healthcare Accommodations Tool, which is an online form the adult (with support if necessary) fills out about themselves and what helps them have a better experience at the doctor’s office. After they fill out the form, it creates a nice letter they can bring to their doctor that explains what accommodations they need. There are a couple of sample letters here and here. They also have some other worksheets to print out and use, including a symptoms worksheet to fill out before the office visit, to help autistic adults organize their thoughts and communicate more easily with the doctor once they get there.