Sterile Compounding, Aseptic Technique, and Hospital Pharmacy Practice
What the domain tests
This domain tests preparation of sterile products and hospital pharmacy operations: cleanroom classification, aseptic technique, garbing, environmental monitoring, beyond-use dating, hazardous-drug handling, and verification of compounded sterile preparations. Exam items often ask what went wrong in a sequence or which engineering control is required.
Core rules and concepts
- Aseptic compounding requires a designated cleanroom with an ISO 5 critical work zone, usually a laminar airflow hood or biological safety cabinet, plus appropriate background air quality.
- Garbing follows a sequence: hand hygiene, shoe covers, head and facial hair covers, mask, sterile gown, and sterile gloves; gloves are sanitized with 70% isopropyl alcohol before manipulation.
- First-air principle: critical sites must remain in first air; avoid blocking airflow and avoid contact with non-sterile surfaces.
- Beyond-use dates depend on risk level, starting components, storage, and whether the preparation is sterile and preservative-free. High-risk preparations require longer terminal sterilization or stringent validation.
- Hazardous drugs require a biological safety cabinet, closed-system transfer devices where appropriate, and safe waste handling.
Worked example
A pharmacist compounds a total parenteral nutrition bag containing calcium and phosphate. The order is at risk of precipitation, which can be fatal if infused. The correct reasoning is to check compatibility, concentration, order of mixing, pH, and temperature; add phosphate and calcium in the prescribed sequence with adequate dilution; inspect the final bag; and use an inline filter as required. The trap is assuming that a clear bag immediately after mixing guarantees stability.
Traps that cost marks
Do not use a horizontal laminar airflow hood for hazardous drugs. Do not let sterile gloves touch non-sterile surfaces. Do not assign arbitrary beyond-use dates. Do not skip visual inspection or filter use when required.
Key points
- ISO 5 is the critical work zone for aseptic compounding.
- Garbing and first-air technique prevent contamination.
- Calcium-phosphate precipitation in TPN is a serious compatibility risk.
- Hazardous drugs need a biological safety cabinet and safe handling.
- Beyond-use dates depend on risk level and storage.