Positive Spore Test on a Monday Morning
On Monday morning the assistant opens the sterilization area and reads the biological indicator (spore test) from Friday's last autoclave cycle: it is positive for growth. The autoclave log shows the cycle reached the correct temperature and pressure for the full time, and the chemical indicator strips inside the packs had changed color. Twelve wrapped instrument packs from that Friday run are still on the shelf, unopened. Two packs from the same run were opened and used Friday afternoon for a banding and an adjustment; those instruments were then reprocessed in the same autoclave on Saturday morning, a cycle whose spore test has not yet been read. The office has one autoclave in use; the backup unit is at the practice's second location and takes about two hours to retrieve. Monday's schedule has 14 patients, including three bondings that require sterile instruments. The policy manual states that the practice follows the manufacturer's IFU and current CDC recommendations for sterilization monitoring, and the exposure control plan names the office manager as responsible for sterilization records. The orthodontist is already seated with the first patient.
1. What are the immediate actions, and what happens to the twelve packs on the shelf?
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Treat the load as non-sterile until the failure is explained.
- Quarantine the 12 packs: pull them from the shelf, label them "hold - do not use," and do not open, discard, or rewrap them yet. They are the evidence.
- Notify the office manager (named in the exposure control plan) and the orthodontist.
- Take the unit out of service until the cause is identified. Review the log and printout, loading pattern (overloading, packs packed too tightly, wrong packaging), and the manufacturer's IFU for the cycle used.
- Retest with a biological indicator and a control, following the IFU; if it is positive again, keep the unit down and arrange service before returning it to use.
- Use the backup autoclave for Monday's sterile needs rather than delaying the three bondings.
A chemical indicator changing color only shows exposure to the cycle conditions; it never proves sterility, so it cannot rescue a failed spore test.
2. What should be done about the two packs already used on patients Friday?
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This is not the assistant's decision to make alone, and it should not be handled quietly. A positive spore test means the cycle failed; it does not prove that every instrument in that load was contaminated, and the risk to those two patients is likely low. But the practice - orthodontist and infection control lead, with the office manager - must decide whether patient notification or follow-up is warranted, based on what the instruments contacted (intact mucosa versus open tissue) and on state and CDC guidance.
The assistant's role is to assemble the facts: which packs were used, on which patients, which instruments, and on what date. Do not call patients on your own, and do not write the event up as minor. The Saturday reprocessing cycle also has an unread spore test, so those instruments stay quarantined until that result is read - a second failed cycle changes the picture substantially.
3. How does the assistant protect Monday's schedule and document the event?
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Schedule: retrieve or use the backup autoclave, or draw on pre-sterilized stock, for the three bondings; ask the orthodontist which visits can safely move. Never pull a pack from the failed load because the chemical strip looked right.
Documentation goes in the sterilization log: date and time the positive result was read; the cycle and load involved; quarantine of the 12 packs; persons notified and when; corrective actions; retest results with controls; and the date the unit returned to service. Retain the failed indicator and control per policy. Because the exposure control plan assigns sterilization records to the office manager, route the record there and confirm the retest result is filed before the next Monday. If the unit fails a second time, the manufacturer's service representative is the next step, and the practice should be prepared to explain to patients why appointments moved.