Blood Transfusions (IMAGE) Johns Hopkins Medicine Caption A five-year effort across the Johns Hopkins Health System to reduce unnecessary blood transfusions has improved patient care and yielded a 400 percent return on investment. Credit Keith Weller Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.