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Safety of refrigerated storage of admixed parenteral fluids.
Journal of Clinical Microbiology 1988 September
Many hospital pharmacies are reluctant to store admixed parenteral fluids longer than 24 to 48 h because of concern about possible microbial contamination. We evaluated the safety of prolonged refrigerated storage of admixtures by culturing mixtures in 471 bags prepared routinely in a hospital pharmacy and stored at 4 degrees C for up to 15 days. Low-level contamination (1 CFU per bag) was found in 3 of 253 solutions of saline and/or glucose into which nonantibiotic additives had been injected. None of 171 saline and/or glucose solutions with antibiotic additives or 47 parenteral nutrition fluids was culture positive. The risk of contamination did not increase with duration of storage, and none of 107 bags stored greater than or equal to 5 days was culture positive. Laboratory studies to measure growth of bacteria and fungi in glucose infusate and parenteral nutrition solutions confirmed that storage at 4 degrees C suppresses growth. Eight of twelve bacterial isolates grew in glucose solutions at 25 degrees C, while none grew at 4 degrees C. Of 13 species of bacteria and fungi inoculated in parenteral nutrition fluids, 8 proliferated at 25 degrees C and none proliferated at 4 degrees C. We conclude that refrigerated storage of parenteral fluids for up to 1 week following admixture, as permitted by Centers for Disease Control guidelines, does not appear to increase the risk of microbial contamination when standard aseptic procedures for admixing and storage are followed.
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