Positive Biological Indicator, Implants on the Clock
At 22:00 a 10-tray steam load finishes in a 24 x 36 x 48-inch gravity-displacement sterilizer. It contains two trays of total hip implants and one loaner spine set. The morning Bowie-Dick test passed. The load's biological indicator is a 3-hour fluorescent-readout type. At 02:45 the relief technician reads the BI and reports a positive; the control is negative. At 05:00 the OR calls for the implant trays for a 06:30 start, noting that every external and internal chemical indicator in the load was acceptable. The previous load in the same sterilizer had a negative BI.
1. Define the scope of the recall and explain the reasoning behind each boundary you draw.
Read the worked answer
Scope: every item in that 10-tray load, plus any item processed in that sterilizer since the last confirmed negative BI - which, on these facts, is the previous load if its BI result is documented and negative. Do not extend the recall to loads run in a different sterilizer unless you have evidence the failure is common to both (shared steam supply, shared packaging lot, shared loading practice).
Reasoning:
- A positive BI with a negative control indicates the failure is in the process, not the incubator or the test system. That makes the whole cycle suspect, not one tray.
- The chemical indicators are not exculpatory. They confirm exposure to the process - heat, steam, time - not lethality. A load can turn every CI dark and still fail.
- Quarantine physically and label clearly. Do not let OR staff "just take a look" at a quarantined cart.
If any item from the affected scope was already used, this becomes a look-back: notify infection prevention and risk management immediately and begin patient notification through the facility's process, not informally.
2. The OR is pressing for the implant trays at 05:00. What is your answer, and what does that mean for the implants in the load?
Read the worked answer
The answer is no.
- Implants must be quarantined until the load's BI is negative. That is not a scheduling preference; it is the reason implant loads are treated separately in the first place. A positive BI means the load did not meet the lethality assurance you rely on.
- Chemical indicators cannot substitute. You cannot reason your way to release because the CIs are acceptable - that inverts the hierarchy of the monitoring system.
- If the implants are needed urgently, the path is a new load in a sterilizer that is performing, with its own BI and, per policy, an early-readout BI for the implant quarantine release. It is not a path through the failed load.
Communication: tell the OR charge nurse and the surgeon's designee directly and early, in plain language: the load failed biological monitoring, the implants are quarantined, and here is the real timeline for a replacement load. Notify the supervisor, infection prevention, and risk management. Vague answers at 05:00 produce pressure at 06:00.
3. What must happen to the sterilizer and to the rest of the shift's work before that unit goes back into service?
Read the worked answer
Sterilizer: place it out of service, tag it, and notify the supervisor and maintenance. Investigate the cause before anything else runs: cycle parameters and printout, steam quality and supply, door gasket and chamber integrity, whether the load was properly loaded (density, container orientation, no tray against the door), packaging and wrapper lot, and the BI lot itself.
Before return to service: the cause must be identified and corrected, then the unit re-challenged with a Bowie-Dick and a BI. Many facilities require a defined number of consecutive negative BIs (often three) before resuming patient loads - follow your written policy and the sterilizer manufacturer's guidance, and document the decision.
Rest of the shift: any load run in that unit after the last confirmed negative BI is suspect and quarantined. Other sterilizers are unaffected unless the investigation implicates a shared cause. The failed load's contents go back through decontamination - they are not simply re-sterilized in their current packaging, because you cannot assume the packaging survived and the instruments may now be wet or contaminated. Document everything contemporaneously; this record will be reviewed.