Pharmacy OneSource Blog

Investigation and Remediation of Environmental and Personnel Sampling Excursions. Written by CriticalPoint

The table below depicts required personnel and environmental sampling as well as CriticalPoint’s recommended frequencies:?

At this time, Chapter <797> states that any growth (even one cfu) be sent out for identification to the genus level. The rationale for this was in case any of the growth was a “highly pathogenic organism” however any organism can be pathogenic when it is administered intravenously or intraspinally. By essentially requiring significant actions and cost for even 1 cfu (a level of growth that is to be expected), the current version of Chapter <797> has had unintended negative consequences which include:

  • Discouraging more frequent than twice a year testing since actions are required for even usual growths
  • Discouraging the investigation of continued across the board 0 cfu findings…instead of taking action to see why their pharmacy is getting 0 cfu findings (poor media, media compromised by transport, poor sampling technique; poor handling technique; improper incubation, etc.), pharmacies are “relieved” since the zero cfu findings require no action.


CriticalPoint believes that once proper Action Levels are established (per the Action Levels detailed in the chapter or more strict levels determined by each pharmacy based on more frequent, trended results at their location), that specific actions should be required to investigate and remediate findings that exceed the Action Level.

Investigations need to evaluate the following:

  • Type of sample and conditions under which sampling occurred
  • Type of excursion
  • Verification that activities related to sampling were performed correctly
  • Microbial control actions taken since sampling and before results
  • Evaluation of Certification reports, work logs (pressure, cleaning, humidity, etc.), competencies
  • Evaluation of findings:
    • Was growth isolated to one finding?
    • Was growth found in adjacent sites?
    • Was organism the same in contiguous sites?
    • What are the historical growth trends: Is this a first time for this organism or has it been recovered previously?
    • Was the location positive in last 6 months?
    • Was the typical reservoir for the microbe or microbes identified?What is the typical reservoir?
    • Was the excursion found close to a location that would be considered a typical reservoir?
    • Has the location been retested previously?
    • Has the employee had other positive findings?


When an excursion occurs, there must be evidence of an investigation and remediation. There must also be an indication if the remediation was successful and these actions must be documented.

In an effort to assist the field, we have attached a matrix for the initial actions that should occur when an excursion first occurs. The matrix details suggested actions by type of sampling and the ISO class environment in which the sampling occurred.

This article was published in CriticalPoint Pearls in June 2017.

To learn more about investigating and remediating environmental and personnel sampling excursions from Eric S. Kastango, RPh, MBA, FASHP and Abby Roth, BS, ASQ-CMQ , click here to watch the webinar replay.

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