“…The mean ATP values at the end of storage corresponded to 74%, 52% and 51% of initial day‐1 values for CPD, CPD/SAGM and CPD‐A1 units, respectively, and were similar to those of controls (85%, 50% and 53%, respectively). In this study, the ATP levels were comparable to those found by some workers [29,31] but slightly lower (as a percentage of initial ATP levels) than those reported by others [32,33]. They were certainly within the range of 2–3 µmol/g of haemoglobin, which is considered to be normal at the end of storage [34], and compare well to recent UK data for red‐cell storage, showing mean ATP levels of 2·49 µmol/g of haemoglobin (range: 1·74–3·24 µmol/g of haemoglobin) on day 42 [29].…”