The Positive Spore Test
On Monday morning, hygienist Elena learns that the autoclave's biological spore test from Friday was positive. The office manager says, “It's probably a false positive; just run it again and use the autoclave until we know.” The practice has one autoclave and a backup that has not been spore-tested in 8 months. On Friday, 14 patients were treated, and all instruments were processed in the affected unit. Elena also sees that the autoclave log has no record of the last three cycles, and the assistant admits she sometimes skips the dry cycle to save time. The dentist is on vacation and the office manager wants to keep the Saturday schedule. Elena is scheduled to see six patients, including a patient receiving periodontal maintenance and a child needing sealants.
1. What immediate infection-control actions are required after the positive spore test?
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A positive spore test means the sterilizer failed. The autoclave must be removed from service immediately and tagged or locked out. The office manager's “probably false positive” comment does not justify continued use until the test is repeated and the unit is cleared by a qualified service technician. Instruments processed in the affected unit since the last negative test are not considered sterile and must be reprocessed.
The backup autoclave may be used only if it has been properly monitored and spore-tested; an 8-month-old test is not adequate. If the backup cannot be validated, the practice should use disposable instruments, borrow sterile instruments from another verified source, or reschedule non-urgent care. Elena should not treat the six scheduled patients with instruments of uncertain sterility. She should notify the dentist and the infection-control officer immediately and document the time the autoclave was taken out of service.
2. What should be done about the 14 patients treated on Friday and the instruments used?
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The practice should determine which instruments were processed in the affected autoclave and reprocess them before any use. The 14 patients require a risk assessment. The dentist and infection-control lead should review the procedures performed, whether instruments contacted sterile tissue or only intact mucosa, and whether the autoclave had other recent failures. The practice should consult the Georgia Board of Dentistry and its malpractice carrier before deciding on patient notification.
Patients should not be told “it was a false positive” unless that is confirmed. If the risk assessment shows possible exposure to non-sterile instruments, the practice should notify affected patients promptly, explain the situation, and offer appropriate follow-up. All decisions and notifications should be documented. The practice should also review whether the missing cycle records and skipped dry cycles contributed to the failure.
3. What documentation and corrective actions should the practice implement before resuming normal sterilization?
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The practice should document the positive spore test, the date and time the autoclave was removed, which instruments were reprocessed, the patient risk assessment, and any notifications. It should retain the test results and service records. Before returning the autoclave to service, a qualified technician should inspect and repair it, and the practice should obtain negative spore tests as required by the manufacturer and infection-control guidelines.
Corrective actions should include: mandatory logging of every cycle; no skipping the dry cycle; staff retraining on instrument cleaning, packaging, loading, and monitoring; weekly spore testing with documentation; and a written policy for failed tests. The office manager and assistant should be trained that production pressure cannot override sterilization failure. Elena should verify that the backup autoclave has current monitoring before it is used for patient care.