4.1 Point-of-Use Treatment

Why Point-of-Use Treatment Matters

Decontamination does not start in the sterile processing department (SPD) — it starts at the point of use, the operating room or procedure room where the instrument was just used. Point-of-use treatment (also called pre-cleaning or pre-treatment) is everything the surgical team does in the first seconds and minutes after an instrument finishes its task to keep soil moist and removable. On the HSPA Certified Instrument Specialist (CIS) exam, this is framed as the technician's role in educating OR staff on correct pre-treatment, because the CIS often acts as the instrument expert who trains clinical teams.

The enemy is dried bioburden. Bioburden is the population of organic soil — blood, tissue, bone, fat, body fluids, and microorganisms — left on a used device. When blood and protein dry, they polymerize (cross-link into a hardened film) and bond tightly to the stainless steel surface. Dried soil is dramatically harder to remove, can shield microorganisms from later cleaning and sterilization, and is a primary cause of retained soil, biofilm formation, and instruments that fail cleaning-verification testing.

Biofilm deserves special attention: it is a self-protecting matrix of microorganisms and the extracellular slime they secrete, anchored to a surface. Once established inside a lumen or hinge, biofilm resists detergents and even disinfectants, and it can re-seed an instrument after cleaning. Keeping soil from ever drying is the cheapest, most effective way to prevent biofilm from gaining a foothold.

AAMI ST79, the comprehensive guidance for steam sterilization and SPD practice, directs that reusable devices be decontaminated as soon as possible after use to minimize drying. Because instruments often wait in a soiled-utility area and travel to a central SPD, the realistic transport delay can run from 30 minutes to several hours — exactly why moisture must be maintained from the moment of use until cleaning begins.

The Three Core Tasks at the Point of Use

A CIS technician should know the standard point-of-use sequence the surgical team performs before instruments leave the procedure room:

1. Remove gross soil — Wipe instruments with a sterile, lint-free sponge or cloth moistened with sterile water (not saline) to remove visible blood and debris. Flush the lumens of cannulated instruments with sterile water so debris does not dry inside the channel.
2. Keep instruments moist — Apply a pre-treatment product (enzymatic spray, foam, or gel, or a transport-moistening solution) per the device manufacturer's Instructions for Use (IFU). Open box locks and disassemble instruments where directed so the product reaches all surfaces.
3. Transport contained — Place soiled instruments in a closed, leak-proof, puncture-resistant container labeled with the biohazard symbol, then move them to decontamination promptly.

Saline Is Not a Moistening Agent

A classic exam trap: saline (sodium chloride) must never be used to soak, moisten, or transport instruments. Prolonged contact with the chloride ions in saline causes pitting and corrosion of stainless steel, permanently breaching the protective passive layer (the thin chromium-oxide film that makes the alloy stainless). Once that layer is damaged, the instrument rusts and stains at that spot for the rest of its life. Use sterile water or a manufacturer-approved transport/pre-treatment product instead.

Do Not Over-Reach at the Point of Use

Point-of-use treatment is not cleaning and is not disinfection or sterilization. The team is buying time, not reprocessing the device. Pouring full-strength detergent, scrubbing aggressively, or attempting to disinfect at the bedside is outside scope and can damage instruments or expose staff. The goal is simple: keep soil wet and contain the device for transport.

Pre-Treatment Products and Transport Requirements

Pre-treatment products are formulated to cling to instruments and hold moisture through the transport delay. They are not a substitute for cleaning — they buy time and keep soil soluble.

Transport Standard

Once treated, soiled devices are transported under the OSHA Bloodborne Pathogens Standard (29 CFR 1910.1030) and AAMI ST79:

• Containers must be closed, leak-proof, and puncture-resistant, and labeled with the biohazard symbol or color-coded red.
• Sharps are separated and contained to protect staff from injury during handling and unloading.
• Soiled and clean items move along separate, defined pathways so contaminated devices never cross into clean areas (the core principle of the SPD's one-directional, dirty-to-clean workflow).
• Instruments are kept moist during transport; if the delay will be long, choose a foam or gel that resists drying.

Worked Scenario

An orthopedic case ends at 5:00 PM; the SPD will not receive the tray until 6:15 PM. The scrub tech wipes gross blood and bone fragments off the rongeurs with a sterile-water sponge, flushes the suction tip, sprays an enzymatic transport gel over the open instruments, and seals the tray in a covered, biohazard-labeled bin. The gel keeps the bone-laden soil hydrated through the 75-minute wait, so the decontamination tech finds soft, removable debris instead of dried, baked-on bone in the joints — the difference between a one-pass clean and a failed cleaning-verification test.