USP 797 sets requirements for compounded sterile preparations, but a large part of the chapter is actually about the people doing the compounding — not the drug. Before anyone touches sterile product, and on a recurring basis afterward, USP 797 requires documented proof that a compounder can gown correctly and maintain aseptic technique. That proof takes three specific forms: gowning qualification, gloved fingertip sampling, and media-fill testing. Confusing these three — or treating them as a one-time box to check — is one of the more common inspection findings.
The three tests, and what each one actually checks
Gowning/garbing competency. Before anyone is qualified to compound sterile preparations, they have to demonstrate they can don PPE — gown, gloves, mask, hair/beard covers — in the correct sequence without contaminating themselves or the garb in the process. This is typically assessed visually against a checklist the first time, and periodically thereafter.
Gloved fingertip sampling (GFS). After gowning, personnel press their gloved fingertips onto contact plates containing growth media, which are then incubated. USP 797 requires GFS at two distinct points, and the two occasions test different things:
- Immediately after garbing, before any compounding work. This checks garbing technique and hand hygiene specifically — did the gloving and gowning process itself stay free of contamination, independent of any compounding activity. The commonly cited acceptance criterion here is stricter: zero CFU (colony-forming units) total across both hands, and initial qualification typically requires three consecutive passing samples, not just one.
- Immediately after a media-fill test. This checks whether the aseptic manipulations performed during simulated compounding — transfers, reconstitutions, connections — introduced contamination, which is a different failure mode than a garbing problem. The commonly cited acceptance criterion here allows a small margin: no more than 3 CFU combined across both hands.
That distinction — garbing/hand-hygiene competency vs. aseptic-manipulation competency during compounding — is the actual point of running GFS twice rather than once. Treat these specific CFU numbers as a reference to verify against the current USP chapter text and your state board’s adoption of it, since revision cycles have adjusted testing criteria before.
Media-fill testing (MFT). This is the most involved of the three: personnel perform a simulated compounding process using sterile growth medium instead of actual drug, replicating the manipulations (transfers, reconstitutions, aseptic connections) they’d normally perform. The filled media is incubated and checked for growth. A pass demonstrates that the compounder’s actual technique — not just their gowning — doesn’t introduce contamination during the compounding process itself.
How often does this have to be repeated?
Initial qualification for all three tests is required before anyone independently compounds sterile preparations. After that, USP 797 ties reassessment frequency to the category and complexity of what a person compounds — personnel handling higher-risk preparations are generally reassessed more frequently than those working exclusively with lower-risk categories. The chapter sets minimum frequencies, but treat any specific interval you’ve memorized as something to re-verify against the current chapter language, since revision cycles have adjusted these numbers before.
Failures aren’t just a paperwork problem
A failed GFS or MFT result isn’t something to quietly retest and move past. USP 797 expects a documented investigation into what went wrong — technique, environment, or testing method — along with remediation (typically retraining) before that person resumes independent compounding. Facilities that can’t produce this investigation trail for a past failure are one of the more common findings in board and accreditation inspections; the failure itself is often less of a problem than the missing documentation of what happened next.
Where this intersects with the rest of USP 797
Personnel competency testing doesn’t exist in isolation — it’s one piece of the same framework that governs beyond-use dating for the preparations that qualified personnel go on to compound, and it’s layered on top of the broader sterile compounding training requirements states have built on top of the base USP standard. Facilities pursuing PCAB accreditation will find competency testing documentation is one of the first things reviewed, since it’s the clearest paper trail an inspector or accreditor can check against actual practice.
As with USP 800, USP 797 only carries legal force in a state once that state’s board has adopted it — adoption timing and any state-specific modifications to competency testing frequency vary, so confirm current requirements with your state board rather than assuming the base compendial standard applies unmodified.
Building it into a real program
A working competency program documents, per person: initial qualification results (with the required number of consecutive passes), every subsequent GFS/MFT result and its date, any failures and the investigation/remediation that followed, and the category-based schedule that determines when the next reassessment is due. This is the exact record set most inspections and accreditation reviews ask for first — a program that “does the testing” but can’t produce this documented history hasn’t actually met the requirement.
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