In the story, Justin takes great pride in a pint of blood he has donated. This act of giving means more to him than just a medical procedure; it represents a personal connection and a tangible gift from his heart. He feels a strong desire to ensure that his blood is given to someone who will appreciate its significance.
Instead of simply allowing it to be sent off to an anonymous recipient, Justin imagines delivering it himself to the hospital. This reflects not only his commitment to helping others but also his need for a deeper connection, as he yearns for his contribution to matter, for it’s one of the few meaningful things he's done in a long time.