Also, I would love to see a histogram of results among the general population, if that can be found in the literature anywhere. I think it would be helpful context for result interpretation and a useful addition to your FAQ.
My levels of PFOS was the highest, that's "Scotchgard". The house I live in has a very expensive reverse osmosis water filter on the tap so I don't think it's that.
I eat a ton of fish (like everyday) and recently read they are a significant source of PFOS exposure: https://pubmed.ncbi.nlm.nih.gov/36584847/
Some of the limitations of the test are you can't tell if this is past or ongoing exposure. Hence my desire to investigate phlebotomy.
PFOS has a half life of ~2.7 years so it could have been there for a while. Source: https://oem.bmj.com/content/75/1/46
Remember the cool ads in the 90s for pants that would repell water and dirt?