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Background and Objectives: Indian studies on evaluation of storage lesions in red blood cells (RBCs) are either limited to 21 or 28 days or have evaluated limited parameters for 42 days. Moreover, issue of transfusion of "fresh" versus "old" RBC is far from settled. The study serially assesses, up to 42 days, in vitro and in vivo RBC storage lesion parameters, including di-(2-ethylhexyl) phthalate (DEHP) leaching and its comparison with published literature. Methods: The study serially assessed in vitro RBC storage lesion parameters including potassium, lactate, glucose, pH, supernatant hemoglobin, percentage-hemolysis, and DEHP leaching of RBC unit during storage till 42 days. The study also evaluated in vivo recovery of potassium after transfusion of "older" RBC. Results: Serial monitoring of in vitro biochemical parameters showed increase in potassium, lactate, supernatant Hb, and hemolysis% and reduction in glucose and pH. DEHP content of the RBC bag was within no-observed adverse effect limit on days 42. Measurement of serum potassium after transfusion of "older" RBC unit revealed that levels of potassium were within normal limit in all four patients. Sterility testing done on days 42 was negative for all 24 bags. Conclusion: Development of storage lesions is inevitable. Appropriate storage limits the RBC lesions to within normal limits. The increase in potassium, lactate, or hemolysis consequent to aging of blood has little clinical significance in routine transfusion practice. [ABSTRACT FROM AUTHOR]