SPD Storage and Distribution 2 — Questions and Answers
Question 1: What is the recommended temperature range for sterile storage areas?
- Below 50°F (10°C)
- 75°F (24°C) or lower with humidity between 30-60% (Correct answer)
- 80-85°F (27-29°C)
- Temperature is not a factor in sterile storage
Correct answer: 75°F (24°C) or lower with humidity between 30-60%
Maintaining temperature at or below 75°F with controlled humidity prevents condensation and microbial growth that could compromise sterile packaging integrity.
AAMI ST79 recommends sterile storage areas maintain temperatures at or below 75°F (24°C) and relative humidity between 30-60%. These conditions are critical because high temperatures can weaken adhesive seals on peel pouches, humidity above 60% promotes condensation that can wick through packaging barriers, low humidity below 30% causes static electricity that attracts dust particles, and temperature fluctuations cause condensation cycles that repeatedly challenge packaging integrity. Environmental monitoring should be continuous with documented readings, and storage areas should have dedicated HVAC systems separate from the decontamination area.
Question 2: What is the shelf life principle currently recommended for sterile items?
- All items expire after 30 days regardless of packaging
- Event-related shelf life — items remain sterile until an event compromises the packaging integrity (Correct answer)
- Sterile items never expire
- Shelf life depends only on the sterilization method used
Correct answer: Event-related shelf life — items remain sterile until an event compromises the packaging integrity
Event-related sterility maintains that properly packaged items remain sterile indefinitely until a contaminating event such as moisture, tearing, or improper handling occurs.
The event-related shelf life concept, endorsed by AAMI, CDC, and Joint Commission, holds that sterile items remain sterile until an event compromises the package integrity. Events that break sterility include: physical damage (tears, punctures, crushes), moisture contamination, seal failure, improper handling, and environmental exposure. This replaces the older time-related approach (expiration dates). However, facilities must establish inspection protocols — items should be checked for integrity before use regardless of when they were sterilized. Some facilities use a hybrid approach with extended time limits as a trigger for re-inspection rather than automatic reprocessing.
Question 3: How should heavy instrument trays be positioned on sterile storage shelves?
- On the highest shelf for easy visibility
- On lower shelves to prevent crushing lighter packages below and reduce injury risk (Correct answer)
- Stacked on top of each other to save space
- Stored on the floor to maximize shelf space
Correct answer: On lower shelves to prevent crushing lighter packages below and reduce injury risk
Heavy trays are placed on lower shelves to prevent damage to lighter items and reduce ergonomic injury risk from lifting heavy items overhead.
Proper sterile storage placement follows several principles: Heavy items (rigid containers, large instrument sets) go on lower shelves (18-24 inches from floor minimum) to prevent crushing lighter packages, reduce drop risk, and minimize ergonomic strain. Lighter items and peel pouches go on upper shelves where they won't be compressed. Items should be stored at least 18 inches from the floor, 18 inches from the ceiling/sprinkler heads, and 2 inches from outside walls. Shelving should be open-wire design to allow air circulation and should never be overloaded. Items should face label-out for easy identification without excessive handling.
Question 4: What is the purpose of a stock rotation system (FIFO) in sterile storage?
- To organize items alphabetically
- To ensure older sterile items are used before newer ones, preventing items from sitting indefinitely (Correct answer)
- To track which sterilizer processed each item
- To distribute workload evenly among staff
Correct answer: To ensure older sterile items are used before newer ones, preventing items from sitting indefinitely
First-In-First-Out (FIFO) rotation ensures sterile items don't sit unused indefinitely, reducing the risk of undetected packaging deterioration.
FIFO (First-In, First-Out) is a stock rotation principle where newly sterilized items are placed behind older stock, ensuring items are used in the order they were sterilized. Even under event-related shelf life, FIFO is important because it prevents items from sitting in storage for extended periods where packaging degradation might go unnoticed, ensures all items undergo regular handling and implicit inspection, maintains consistent inventory turnover, identifies slow-moving items that may indicate over-ordering, and supports recall traceability when items can be identified by sterilization date. New stock should always be placed at the back or bottom, with older items moved forward.
Question 5: What documentation should accompany items distributed from sterile storage to clinical areas?
- No documentation is needed once items leave storage
- Distribution records including item type, quantity, destination, date/time, and lot/load number for traceability (Correct answer)
- Only the patient's name
- Just the delivery person's signature
Correct answer: Distribution records including item type, quantity, destination, date/time, and lot/load number for traceability
Complete distribution records enable traceability of every item to the sterilizer load and ultimately to the patient, which is essential for any recall situation.
Distribution documentation creates a chain of custody for sterile items from the sterilizer to the point of use. Key elements include: item identification (name, catalog number), sterilizer load/lot number, sterilization date, quantity distributed, destination department/location, date and time of distribution, and distributor identification. Many facilities use automated tracking systems (barcode or RFID) integrated with instrument management software. This documentation is critical for: sterilization recall traceability, inventory management, usage analysis, regulatory compliance, and quality improvement. Joint Commission and CMS require facilities to be able to trace items from the sterilizer to the patient within a reasonable timeframe.
Question 6: Why must sterile storage areas restrict access to authorized personnel only?
- To prevent theft of expensive instruments
- To minimize handling, traffic, and contamination risk that could compromise sterile item integrity (Correct answer)
- To keep the area quiet for concentration
- To comply with fire code regulations
Correct answer: To minimize handling, traffic, and contamination risk that could compromise sterile item integrity
Restricting access minimizes unnecessary traffic, handling, and environmental contamination that could compromise the integrity of sterile packages.
Access control in sterile storage serves multiple infection prevention purposes: reduced foot traffic means less airborne particulate contamination from clothing, skin, and shoes; fewer people means less accidental contact with sterile packages (bumping, dropping, squeezing); controlled access prevents unauthorized removal of items that disrupts inventory management; it maintains positive pressure integrity by limiting door openings; and it supports accountability for any environmental or handling breaches. AAMI ST79 recommends restricted access with designated entry points, and some facilities use card-access systems that log entries for compliance monitoring.
SPD Storage and Distribution 2
What is the recommended temperature range for sterile storage areas?