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Long storage times for blood products are often unavoidable. Product age is essentially the only indicator used today for Red Blood Cell (RBC) quality loss during storage. Much controversy persists over the impact of RBC age on transfusion outcomes, as studies on this remain inconclusive. Such inconsistency may arise from unit-to-unit variability, which likely introduces some age-independence to RBC state. Thus, quality metrics other than storage time could aid with inventory management and/or treatment decisions. RBC membrane mechanical fragility is proposed here as one such candidate in vitro metric: it aggregately reflects a range of biochemical and biomechanical changes associated with storage lesion, and can provide a more comprehensive characterization of particular units than other properties. Preliminary data suggest this property can vary substantially among units of equal age, and further work now in progress is investigating its correlation to post-transfusion red cell survival in vivo.

Investigating Direct Non-Age Metrics of Stored Blood Quality Loss