Residual ethylene oxide (ETO) from sterilization can interfere with microbiological testing and create false-negative results, presenting a significant QC and product-release concern. A leading centrifuge tube manufacturer approached Pinnacle Therapeutics for a more reliable sterilization approach. Gamma sterilization provided a residue-free alternative, helping eliminate ETO-related testing interference and giving the manufacturer greater confidence in product quality, test accuracy, and release decisions.