What action should be taken if a blood donor reports high-risk behavior after donating blood that was transfused to a recipient?

In this scenario, the appropriate action involves notifying the recipient's physician. This is critical because blood safety and patient welfare are paramount. If a donor discloses high-risk behavior after their blood has already been transfused, the physician responsible for the recipient's care must be made aware of this potential risk.

The physician is in a position to assess the situation comprehensively, consider the recipient's health status, and, if necessary, conduct testing or implement monitoring strategies to safeguard the recipient. This response ensures that the potential risk stemming from the donor's behavior is addressed appropriately and timely by the healthcare team.

Notifying both the physician and the recipient (as mentioned in another option) may prematurely alarm the recipient about a situation that the physician needs to evaluate before discussing with them. The physician can best determine what information the recipient should receive and can provide appropriate counseling based on clinical findings.