PTCB Question Walkthrough: Sterile Compounding
Walk through PTCB sterile compounding practice questions. Master beyond-use dating, ISO classifications, aseptic technique, and USP 797 for exam day.
Sterile Compounding Questions on the PTCB Exam
Sterile compounding is a critical knowledge area on the PTCB certification exam. These questions test your understanding of aseptic technique, cleanroom classifications, beyond-use dating, and USP 797 standards. This walkthrough demonstrates how to approach and answer these challenging questions.
Question 1: ISO Classifications
In what ISO class environment must sterile compounding be performed using a laminar airflow workbench?
- A. ISO Class 3
- B. ISO Class 5
- C. ISO Class 7
- D. ISO Class 8
Correct Answer: B
Explanation: The critical compounding area (inside the laminar airflow workbench or biological safety cabinet) must maintain ISO Class 5 air quality. The buffer area surrounding the workbench should be ISO Class 7, and the ante area should be ISO Class 8. ISO Class 5 means no more than 3,520 particles of 0.5 microns or larger per cubic meter of air.
Question 2: Beyond-Use Dating
According to USP 797, what is the maximum beyond-use date for a low-risk compounded sterile preparation stored at room temperature?
- A. 12 hours
- B. 24 hours
- C. 48 hours
- D. 4 days
Correct Answer: C
Explanation: Under revised USP 797 standards, low-risk Category 1 CSPs stored at controlled room temperature have a beyond-use date (BUD) of 48 hours without sterility testing. When refrigerated (2-8 degrees C), the BUD extends. Beyond-use dating varies based on risk level and storage conditions, and these details are frequently tested on the PTCB exam.
Question 3: Aseptic Technique
When using a horizontal laminar airflow workbench, items should be placed at least how many inches inside the hood?
- A. 2 inches
- B. 4 inches
- C. 6 inches
- D. 8 inches
Correct Answer: C
Explanation: All items should be placed at least 6 inches inside the outer edge of the horizontal laminar airflow workbench. This ensures they are within the zone of unidirectional HEPA-filtered airflow. Items placed too close to the edge may be exposed to unfiltered room air, compromising sterility. Additionally, nothing should block the airflow path between the HEPA filter and the critical site.
Question 4: Garbing Procedures
What is the correct order for garbing before entering the buffer area?
- A. Gown, shoe covers, hair cover, face mask, gloves
- B. Shoe covers, hair cover, face mask, hand hygiene, gown, gloves
- C. Hand hygiene, shoe covers, hair cover, gown, face mask, gloves
- D. Hair cover, shoe covers, face mask, gown, hand hygiene, sterile gloves
Correct Answer: B
Explanation: The garbing sequence moves from dirtiest to cleanest areas. In the ante area: shoe covers, hair cover, face mask, and hand hygiene. Then enter the buffer area and don the sterile gown and sterile gloves. Hands should be sanitized with sterile 70% isopropyl alcohol before donning sterile gloves. The key principle is to prevent contamination of already-garbed areas.
Study Strategies for Sterile Compounding
- Memorize ISO classifications for each cleanroom area
- Know beyond-use dating rules for each risk category and storage condition
- Understand the garbing sequence and aseptic technique principles
- Study the differences between horizontal and vertical laminar airflow hoods
- Review USP 797 requirements for cleaning, environmental monitoring, and personnel training
Take sterile compounding practice tests at PTCBprep and strengthen your knowledge at your study dashboard.
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