“…However, three of these studies 10–12 included relatively few transfusions of RBCs actually stored longer than 14 days and did not address the use of extended‐storage anticoagulant or preservative solutions, as are commonly used at the present time. Moreover, on the basis of in vitro studies of AS‐3, concerns were raised about levels of potassium, phosphate, glucose, and citrate in RBCs stored in extended‐storage media for neonatal transfusions 16 . Accordingly, data from studies of AS‐1 and AS‐3 RBCs stored up to 42 days before transfusion to preterm infants 8,9 will be summarized in detail in the following paragraphs.…”