Jehovah’s Witnesses have revised their longstanding policy on the medical use of donated blood, allowing members to receive blood-derived products while maintaining a ban on whole-blood transfusions.

According to an AP News report, the policy announced Friday allows members to receive medical treatments involving plasma, platelets and red and white blood cells, while leaving the decision to individual conscience.

“Each Christian must make his own personal decision about the use of these four primary components in all medical and surgical care,” said Geoffrey W Jackson, a member of the organisation’s governing body.

The revised policy also allows members to decide whether to donate blood for use in blood products for the medical treatment of others. However, the organisation continues to oppose whole-blood transfusions and donating blood for that purpose.

The move marks the second revision to the group’s blood policy this year. In March, it announced that members could have their blood stored for their own future medical treatment, but not for others.

The Jehovah’s Witnesses’ opposition to blood transfusions stems from their interpretation of Bible passages requiring believers to “abstain” from blood. Critics, including former members, have argued that the prohibition can prevent the use of potentially lifesaving treatment.