Tosi Test Strips are test objects for monitoring the cleaning efficacy of washer-disinfectors. They function by simulating the joints of surgical instruments. If your washer-disinfector runs its cycle, and the Tosi Strip still has its test soil in place, this means that your washer disinfector is not cleaning to the required minimum standard. Test soil has been designed to correlate to coagulated blood.
Tosi strips comply with AAMI and AORN recommendations, as well as ASTM Guide D7225.
If your Tosi Strip has a visually clean plate, then it means your washer-disinfector has reached its standards of cleaning.