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Background  Optimal procedure for storage of feline blood is needed. Open‐collection systems have been employed in feline medicine, thus limiting the possibility for storage.    Objectives  To evaluate indicators of quality of feline blood stored for 35 days at +4°C in a closed‐collection system specifically designed for cats.    Animals  Eight healthy adult European domestic shorthair cats with a weight of 5‐6.8 kg.    Methods  This is a case series study. A bacteriological test, CBC, blood smear, pH, osmotic fragility, 2,3‐diphosphoglycerate (2,3‐DPG), and adenosine triphosphate (ATP) measurement were performed weekly on whole blood (WB) units from day 1 to day 35 after donation. The hemolysis index, lactate and potassium concentrations, prothrombin time (PT), activated partial thromboplastin time (aPTT), and fibrinogen were measured on plasma aliquots.    Results  One out of eight blood units (BUs) had bacterial growth ( Serratia marcescens ) at day 35. No significant differences were found regarding CBC, morphology, pH, and osmotic fragility. Despite high inter‐individual variability and low starting levels, significant decreases in the mean concentrations of 2,3‐DPG (T0 1.99 mmol/g Hb, SD 0.52, T35 1.25 mmol/g Hb, SD 1.43;  P  = .003) and ATP (T0 1.45 mmol/g Hb, SD 0.71, T35 0.62 mmol/g Hb, SD 0.51;  P  < .001) were detected during the study, as opposed to an increase in hemolysis (T0 0.11 mmol/L, SD 0.07, T35 0.84 mmol/L, SD 0.19;  P  < .001), lactate (T0 3.30 mmol/L, SD 0.86, T35 13.36 mmol/L, SD 2.90;  P  < .001), and potassium (T0 3.10 mmol/L, SD 0.21, T35 4.12 mmol/L, SD 0.35;  P  < .001) concentrations.    Conclusions and Clinical Importance  The commercial BU kit is appropriate for blood collection and conservation of WB in cats. The maintenance of WB quality indicators during storage is essential for future improvements of feline transfusion medicine.

In vitro assessment of quality of citrate‐phosphate‐dextrose‐adenine‐1 preserved feline blood collected by a commercial closed system