Praise be to Allaah.
It is not permissible to sell blood, because of the
report in Saheeh al-Bukhaari from the hadeeth of Abu Hudhayfah, who
said: “I saw my father buy a cupper [a person who does cupping] and
order that his tools be broken. I asked him about that and he said, ‘The
Messenger of Allaah
(peace and blessings of Allaah be upon him)
forbade the price of blood, .....’” (Al-Bukhaari, 3/12,43; Ahmad, 4/308, 309).
Al-Haafiz said in al-Fath: what is meant by the prohibition of
blood is the same as the prohibition of dead meat and pork. It is haraam
according to scholarly consensus, i.e., selling blood and taking its
price. And Allaah knows best.