They don't test your spit, though. They just analyze the raw data, so you have to already have had DNA testing done. You have to download the raw data from another service who took your spit and analyzed your DNA, like ancestry or 23andMe, then upload it to promethease.
They have a ton of info. It's impossible to print it all or to try to open all the info at once, but you can do searches, and you can download the file(s) to your computer for viewing later. If you make an account, you can access your info for 45 days. The quote below applies only to those who make an account when they ask for the service.
New information is added to SNPedia on a daily basis, and while your DNA won't change, our understanding will continue to improve.
We will save your report for 45 days. You will be able to regenerate it later, with the most up-to-date information available on SNPedia.