The Morning the Buffer Room Gauge Reads 0.005

Take them one at a time rather than treating the sheet as pass/fail:

• Buffer room differential pressure +0.005 in WC - below the SOP minimum. This is the most serious finding: the pressure cascade is the basis for protecting the ISO 5 from adjacent, dirtier spaces. A drifting gradient suggests HEPA loading, damper drift, a door seal, or an HVAC problem, and it undermines the classification the whole suite rests on.
• ISO 7 active air 14 CFU/m³ vs. action level 10 - action-level exceedance, requiring investigation, not necessarily immediate shutdown.
• Surface 7 CFU vs. action level 5 - action-level exceedance; points at cleaning/disinfection practice or a contaminated item on the counter.
• Gloved fingertip 4 CFU vs. action level 3 - a personnel failure. That technician should not compound until it is resolved.
• 78 fpm - within 90 fpm ± 20% (72–108 fpm). Do not fail it on the number; trend it.
• All ISO 5 samples 0 CFU - reassuring for the critical zones but does not cancel the room-level pressure problem.

The environmental and pressure findings are not independent; taken together they suggest a room-level, not a single-hood, issue.

Sequence:

1. Take the buffer room out of service for compounding until the pressure is diagnosed and restored.
2. Investigate: HVAC work orders and recent construction, HEPA loading/differential, damper position, door seals and door-closing habits, recent cleaning records, and any change in personnel or technique. Review trended EM data - was the air count rising before Friday?
3. Clean and disinfect the affected surfaces, then re-sample per the site's investigation policy; do not accept a single repeat sample as closure without a cause.
4. Restore the pressure gradient and document verification before resuming.

The doses: the four antibiotic doses may be prepared only if an alternative environment is currently validated and in compliance (e.g., the other CAI within a room whose pressure has been restored); otherwise they wait or are transferred/outsourced. The chemotherapy doses cannot be made - they require the negative-pressure HD environment, and the compounding technician fails gloved fingertip sampling regardless. Call the prescriber and nursing early about the delay. "It's due at 09:00" is not a release criterion, and the pressure excursion is exactly the kind of finding that gets retroactively explained after a contamination event.

Re-certification is required on the routine interval (every six months per USP <797>) and after any repair or change that could affect airflow - HEPA replacement, fan or damper adjustment, ductwork, door hardware, or renovation. So:

• If the fix is a door seal or a cleaning problem, verify by monitoring and document; certification may not be triggered.
• If the fix touches the HVAC or air-handling components, re-certify before returning to service, even though the scheduled certification is months away.

Documentation to close the event: the excursion data, the investigation and root cause, the corrective actions with dates, the verification/re-sampling results, the re-certification report if applicable, the personnel action on the failed gloved fingertip (retraining, repeat sampling, removal from compounding until passing), and review at the quality/QA committee. Assign the trend review as a standing follow-up so the same drift is caught by data rather than by luck.