

Yes and no.
If you regularly donate, your PFAS levels will be well below average, so your blood/plasma will actually lower the recipient’s concentrations. Not quite as low as it brings down your concentrations, but still lower than average.
Further, with plasma, they extract the proteins to produce various medications. That process leaves the PFAS with the remaining, depleted plasma, which is then discarded.
But, even if your concentrations are significantly above average, and the recipient receives whole blood/plasma from you, they are only receiving 1 unit from you, adding to 8 or 9 units of their own. Their net blood concentration rises only 1/8th above average as your own concentration.
The lifesaving value of your PFAS-contaminated blood is infinitely higher than the risks posed by your PFAS.
Tl;dr: Don’t discard your blood.
We are comprised of tangled chains of hydrogen, oxygen, carbon, with a sprinkle of various others. Plastic is slightly more complex chains, developed from the dead and entombed carcasses of ancient flora and fauna. That entombment process adjusts, but doesn’t fundamentally alter the chemistry of those chains.