Question:
Assalamu Alaika Ya Shaykh, I have two questions:
1) Will donating plasma nullify fasting (it involves withdrawing of blood, removing the plasma and returning it back to the body)?
2) Can one sell his plasma?
Answer:
Waalaykumussalam,
Drawing blood does not nullify fasting except in the Hanbali school (Dr Samer al-Nass). Likewise blood transfusion does not nullify fasting: see https://islamqa.org/hanafi/
As for selling plasma it is permissible in other than the Hanafi school (Dr Samer al-Nass).
Hajj Gibril Haddad