If donator's blood has same concentration of pfas as recipients, the recipient's concentration does not change! Also, the recipient has probably just lost blood

If donator's blood has same concentration of pfas as recipients, the recipient's concentration does not change! Also, the recipient has probably just lost blood, so total amount of pfas won't change either, and taking into account that people that donate blood do so often with some regularity, the donators blood actually is likely to have less pfas than the recipients original blood.