Decontamination
Decontamination
The first step in instrument reprocessing and how the workflow is organized.
Workflow & One-Way Flow
Sterile processing follows a ONE-WAY workflow from DIRTY to CLEAN to STERILE so contaminated and clean items never mix.
The department is divided into zones: the DECONTAMINATION area (dirty), the prep/pack and clean area, and the sterile storage area. Air pressure is controlled — decontamination is NEGATIVE pressure (air flows in, contaminants don't escape); clean areas are POSITIVE pressure.
Point-of-Use & Transport
Decontamination begins at the POINT OF USE: keep instruments moist (pre-treatment spray/gel) so soil and blood don't dry on and harden, which makes cleaning much harder.
Contaminated instruments are transported in closed, leak-proof, labeled (biohazard) containers. Staff in the decontamination area wear full PPE: gloves, fluid-resistant gown, mask, and face/eye protection.
Decontamination Steps
In the decontamination area, instruments are: • SORTED and disassembled. • Pre-cleaned/rinsed (cool water — hot water can coagulate protein/blood onto instruments). • Cleaned manually and/or in mechanical washers (ultrasonic, washer-disinfectors).
The ULTRASONIC cleaner uses CAVITATION (tiny imploding bubbles) to remove soil from hard-to-reach areas. Cleaning must happen before disinfection or sterilization — you cannot sterilize a dirty instrument.
📖 Key Terms
- One-way workflow
- Dirty → clean → sterile flow so contaminated and clean items never mix.
- Point-of-use treatment
- Keeping instruments moist right after use so soil doesn't dry on.
- Negative pressure
- Airflow in decontamination that keeps contaminants from escaping.
- Cavitation
- Imploding bubbles in an ultrasonic cleaner that remove soil.
💡 Exam Tips
- ▸Workflow is one-way: dirty → clean → sterile.
- ▸Decontamination is negative pressure; clean areas are positive pressure.
- ▸Use COOL water for pre-cleaning — hot water coagulates protein/blood.
- ▸You cannot sterilize a dirty instrument — clean first.