How frequently are surface samples required to be taken from the hood in a Category 1 CSP preparation?

In the context of sterile compounding, particularly for Category 1 Compounded Sterile Preparations (CSPs), surface sampling is an important part of the quality control process. The correct frequency for surface samples to be taken from the hood in a Category 1 CSP preparation is monthly.

This monthly requirement ensures that the working environment remains free from microbial contamination and that the aseptic technique is being maintained effectively. Regular surface sampling helps to assess the cleanliness of the compounding area and to identify any potential issues with the environmental controls that might affect patient safety.

In contrast, more frequent sampling such as daily or weekly may be overkill for Category 1 CSPs, where the risk is generally lower compared to Category 2 CSPs, which require more stringent monitoring due to their longer stability periods outside a controlled environment. Annual sampling is insufficient for ongoing assurance of a consistently sterile compounding environment, as it does not provide enough timely information to catch potential contamination issues. Hence, monthly sampling strikes the appropriate balance between sufficient monitoring and practical operational frequency.