The Attest Biological Indicators are test strips to monitor the sterilization process and ensure all spores were killed. A nonpathogenic but highly resistant spore, Geobacillus sterothermophilus, is used to provide a maximum challenge to the steam sterilization process. Self-contained biological indicators Design provides maximum challenge to various steam sterilization cycles A spore burden beyond the average bioburden provides an extra margin of safety Optimized media promote rapid growth of spores Definitive color change of the media indicates sterilization process ineffectiveness Quick verification time of 24-48 hours versus one-week, mail-in services