(TNS) — The Centers for Disease Control wants to take a deeper dive into just what is in our blood.

Specifically, according to multiple reports, the CDC is now asking doctors to consider doing more blood tests that search for PFAS — cancer causing “forever chemicals” — in their patients’ blood.

“This information is intended for individuals and communities around the country, who are concerned about exposure to PFAS to have productive conversations with their medical providers,” Dr. Aaron Bernstein, Director of CDC’s National Center for Environmental health and the Agency for Toxic Substances and Disease Registry, told ABC News.

Bernstein told ABC that “over 90%” of people in the United States have bene exposed to PFAS.

“We’ve learned more and more in recent years about how exposures to PFAS may increase risk for many diseases,” Bernstein said.

PFAS are called “forever chemicals,” because they can linger in water and air for thousands of years. And they are, particularly, bad for humans once inside the body. PFAs, as they are known, have been linked to cancer, liver damage and other health issues.

Most are exposed to PFAS through drinking water, but the chemicals have increasingly been found in food and even in animals.

The move to begin blood testing more for PFAS is designed to try to help “guide exposure reduction or provide psychological relief to patients,” per the report.

Currently, according to ABC, there are no approved treatments to help reduce the level of PFAS in a person’s body.

“A PFAS level is one piece of data that needs to be taken in a broader context,” Bernstein said. “We need to understand the individual’s health history, their family history, what other exposures they may have that might increase the risk of diseases that can also be associated with PFAS.”