There are tests to determine whether PCBs are in the blood, body
fat, and breast milk. These are not regular or routine clinical
tests, butcould be ordered by a doctor to detect PCBs in people
exposed to them in the environment and at work. If PCB levels
are higher than thebackground levels, this will show that you
have been exposed to high levels of PCBs. However, these
measurements cannot determine the exactamount or type of PCBs
that you have been exposed to, or how long you have been
exposed. Although these tests can indicate whether you have
beenexposed to PCBs to a greater extent than the general
population, they do not predict whether you will develop harmful
health effects. Bloodtests are the easiest, safest, and probably
the best method for detecting recent exposures to large amounts
of PCBs. Results of such testsshould be reviewed and carefully
interpreted by physicians with a background in environmental and
occupational medicine. Nearly everyone hasbeen exposed to PCBs
because they are found throug