Medium NAPLEX USP 797 Practice Questions

Mastering USP Chapter 797 is essential for any pharmacy graduate preparing for the licensure exam, as sterile compounding standards ensure patient safety and medication efficacy. These Medium NAPLEX USP 797 Practice Questions focus on the 2023 revisions, covering critical topics such as beyond-use dates (BUDs), garb sequences, and environmental monitoring. Understanding these regulations is just as vital as mastering infectious disease pharmacotherapy, as improper compounding technique can lead to life-threatening healthcare-associated infections.

The United States Pharmacopeia (USP) sets these legally enforceable standards for all persons who prepare compounded sterile preparations (CSPs). By integrating these standards into your NAPLEX Prep, you ensure that you are ready for the complex regulatory and clinical scenarios presented on the exam.

Concept Explanation

USP Chapter 797 is a set of rigorous standards designed to prevent patient harm resulting from microbial contamination, excessive bacterial endotoxins, variability in intended strength, or unintended chemical physical contaminants in compounded sterile preparations (CSPs). The chapter defines the environmental requirements for the cleanroom, including the use of Primary Engineering Controls (PECs) like laminar airflow workbenches and Secondary Engineering Controls (SECs) like buffer rooms and ante-rooms. A core component of the regulation involves the categorization of CSPs into Category 1, Category 2, and Category 3 based on the conditions under which they are made and the probability of microbial growth.

Key requirements include:

• Environmental Monitoring: Regular testing of air and surfaces for microbial growth.
• Personnel Competency: Initial and ongoing testing of garbing and aseptic technique via media-fill tests and gloved fingertip testing.
• Beyond-Use Dates (BUDs): Time limits for CSPs based on sterility risks and storage temperatures.

For those looking to streamline their memorization of these complex tables, using an AI Flashcard Generator can help reinforce the specific BUD intervals and ISO class requirements.

Solved Examples

1. Determining ISO Class Requirements: A pharmacy is designing a new cleanroom suite. What is the minimum ISO classification required for the buffer room and the ante-room (opening into a positive-pressure buffer room)?
   1. Identify the Primary Engineering Control (PEC) location: The PEC (e.g., a hood) must be ISO Class 5.
   2. Determine Buffer Room requirements: The room surrounding the PEC (the buffer room) must be ISO Class 7.
   3. Determine Ante-room requirements: For a positive-pressure suite (non-hazardous), the ante-room must be at least ISO Class 8.
   4. Answer: Buffer room = ISO 7; Ante-room = ISO 8.
2. Calculating Beyond-Use Dates (BUD): A Category 2 CSP is prepared in a cleanroom using only sterile components. It is filtered through a 0.22-micron filter and then stored in a refrigerator. What is the maximum BUD?
   1. Identify the Category: Category 2.
   2. Identify the starting components: Sterile components (no terminal sterilization mentioned, but aseptic processing is used).
   3. Check the 2023 USP 797 BUD table for Category 2 (aseptically processed): Controlled Room Temperature = 4 days; Refrigerated = 10 days; Frozen = 45 days.
   4. Answer: 10 days.
3. Gloved Fingertip Test (GFT) Frequency: How often must a staff member performing Category 1 and Category 2 CSPs undergo competency testing for gloved fingertip sampling?
   1. Initial competency: Must pass 3 successful GFT collections (0 CFUs) before compounding.
   2. Ongoing competency: For Category 1 and 2, this must occur at least every 6 months.
   3. Note: For Category 3, this frequency increases to every 3 months.
   4. Answer: Initially (3 times) and then every 6 months.

Practice Questions

1. A pharmacist is preparing a sterile compound in a Segregated Compounding Area (SCA). According to USP 797, what is the maximum Beyond-Use Date (BUD) for this Category 1 CSP if stored at room temperature?
2. Which of the following is the correct order for donning Personal Protective Equipment (PPE) when entering the sterile compounding area?
3. During a media-fill test for a technician who compounds Category 2 CSPs, how long must the bags be incubated, and at what temperatures?

4. A pharmacy uses a laminar airflow workbench (LAFW) for compounding. How often must the PEC be certified to ensure it meets ISO Class 5 standards?
5. A Category 2 CSP is prepared using non-sterile starting components and is terminally sterilized in an autoclave. If stored at room temperature, what is the maximum BUD?
6. According to USP 797, what is the minimum frequency for surface sampling in the buffer and ante-rooms for pharmacies compounding Category 1 and 2 CSPs?
7. Which cleaning agent must be used daily to remove organic matter and residue from the interior surfaces of the PEC?
8. A multi-dose vial of a preservative-free sterile medication is punctured in an ISO Class 5 environment. What is the maximum time the vial can be used?
9. If a cleanroom's pressure gauge shows a pressure differential of $0.01$ inches of water column between the ISO 7 buffer room and the ISO 8 ante-room, is this compliant with USP 797?
10. A technician is compounding a total parenteral nutrition (TPN) bag. This involves transferring multiple sterile ingredients into a single container. What category of CSP is this under the revised USP 797?

Answers & Explanations

1. 12 hours: Category 1 CSPs are those prepared in an SCA (not a full cleanroom suite). The BUD is limited to 12 hours at room temperature or 24 hours if refrigerated.
2. Shoe covers, Head/Facial hair covers, Face mask, Hand hygiene, Gown, Sterile gloves: Garbing proceeds from "dirtiest" to "cleanest." Hand hygiene occurs after the head and face are covered but before the sterile gown and gloves.
3. 14 days total (7 days at $20-25^{\circ}C$ followed by 7 days at $30-35^{\circ}C$): This ensures that both fungal/mold and bacterial growth can be detected.
4. Every 6 months: All PECs and SECs must be certified by an external professional at least every 6 months or whenever the device/room is moved or altered.
5. 45 days: For Category 2 CSPs that are terminally sterilized (not just aseptically processed), the BUD at room temperature is 45 days.
6. Monthly: While air sampling is required every 6 months, surface sampling for Category 1 and 2 must be performed at least monthly.
7. A germicidal detergent: Cleaning involves the use of a detergent to remove soil, followed by disinfection (e.g., sterile 70% IPA) and periodic sporicidal application.
8. 12 hours: Per USP 797, a punctured preservative-free multi-dose vial (if used as a MDV) or single-dose vial (SDV) kept in ISO 5 can be used for up to 12 hours. If kept in worse than ISO 5, it must be discarded after 1 hour.
9. No: The minimum differential pressure required between the buffer room and the ante-room is $0.02$ inches of water column.
10. Category 2: Most complex compounding performed in a cleanroom suite (ISO 7/8) that does not meet the strict requirements of Category 3 (higher frequency testing) falls into Category 2.

1. What is the required ISO classification for the air inside a Primary Engineering Control (PEC)?

• AISO Class 7
• BISO Class 8
• CISO Class 5
• DISO Class 9

Frequently Asked Questions

What is the difference between Category 1 and Category 2 CSPs?

Category 1 CSPs have shorter beyond-use dates and can be prepared in a segregated compounding area, whereas Category 2 CSPs are prepared in a full cleanroom suite and allow for longer storage times. Category 2 requires more stringent environmental controls and personnel testing to justify the extended BUD.

How often should hand hygiene be performed during compounding?

Hand hygiene must be performed immediately before donning the sterile gown and again every time hands are contaminated or when the compounder leaves and returns to the buffer area. Additionally, sterile 70% isopropyl alcohol must be applied to gloves frequently during the compounding process.

Can I use a single-dose vial for more than one patient?

According to USP 797 and CDC guidelines, single-dose vials should ideally be used for only one patient; however, if punctured in ISO Class 5 air, they may be used for up to 12 hours for multiple entries for the same or different patients.

What is the minimum frequency for air sampling?

Air sampling must be conducted at least once every 6 months to ensure the microbial load in the cleanroom remains within acceptable ISO limits. This testing is often performed in conjunction with the semi-annual certification of the PECs and SECs.

What happens if a surface sample exceeds the action limit?

If microbial growth exceeds the action levels (e.g., > 3 CFU for ISO 5), the pharmacy must investigate the cause, perform a root cause analysis, and implement corrective actions such as re-cleaning or re-training. Compounding may need to be suspended if the contamination is significant.

Do I need to wear a gown in a Segregated Compounding Area (SCA)?

Yes, even in an SCA, the compounder must follow proper garbing procedures, which include a low-lint gown, head cover, mask, and sterile gloves to minimize the risk of introducing contaminants into the PEC. Proper garbing is a fundamental requirement regardless of the room's ISO classification.