Preparation and Packaging
Between cleaning and sterilization sits the work that decides whether an instrument is safe and functional in a surgeon's hand, and whether a sterile package will still be sterile when it is opened. This is the second of three HSPA sections that tie at 21 percent each. The outline walks the section in the order the work actually happens: make the area and its supplies ready, inspect and test every item, assemble the set, choose the indicator that goes inside it, apply the packaging, and label it. This chapter follows that order.
Area Safety and the Equipment on the Bench
The preparation and packaging area feels benign compared with decontamination, which is exactly why HSPA opens the section with safety. The hazards here are hot carts and trays coming off a cooling rack, wet floors at the pass-through, and sharps — because every instrument on the bench is clean but many are still sharp, and a technician working quickly through a set of scissors and osteotomes is at real risk. Clean items are handled with clean, dry hands, sharp items are laid down rather than passed hand to hand, and hot items stay on the cart until they are cool enough to handle. Three pieces of equipment on this bench are examinable in their own right. Heat sealers close peel pouches with a validated seal and are only as good as their settings, so temperature and pressure are verified per the manufacturer's instructions on the schedule the manufacturer sets, and seals are checked for a complete, continuous, uniform seal across the full validated width with no channels, wrinkles, or burned-through spots. A seal that peels open cleanly with an even fiber tear is good; a seal you can pull apart at one point is a failure and the pouch is remade. Insulation testers check the insulating jacket on laparoscopic and other electrosurgical instruments, because a pinhole break in that jacket lets electrosurgical energy escape to tissue the surgeon cannot see, producing a burn outside the field of view — one of the more serious injuries that traces back to a reprocessing department. AORN's guidance is to test insulation before each use, and any instrument with a detected break is removed from service. Scope inspectors and borescopes let the technician look inside a lumen or a flexible endoscope channel, where visual inspection with the naked eye is impossible, revealing retained soil, scratches, dents, and corrosion no external look can find. The area itself has its own cleaning routine, with work surfaces cleaned and disinfected at least daily and whenever soiled, and its own environmental requirements, covered in Chapter 1. It needs task lighting plus lighted magnification at every inspection station, because most of what you are looking for is invisible under ordinary overhead light. Preparation and packaging is a restricted area on the clean side of the department, entered in surgical attire with hair covered, and nothing arrives here except items that have completed decontamination. Supplies are staged before assembly begins, and that is not a housekeeping nicety: a technician who has to leave a half-assembled tray to hunt for a tip protector is the technician who loses count. The bench needs chemical indicators and integrators of the correct class for the cycle the package will run in, tip protectors in the sizes the set uses, foam and instrument mats, tray liners, sterilization indicator tape, an approved non-bleeding marker, count sheets, labels, and packaging materials matched to the intended sterilization method. Supplies are checked for their own condition too, since wrap that has been crushed or stored damp, indicators past their expiration date, and self-seal pouches whose adhesive has aged are defects that will not be visible once the package is closed.
Item Inspection and Functional Testing
Every instrument is inspected individually under lighted magnification before assembly. Mechanical cleaning reduces bioburden but does not guarantee that a specific device came out clean and functional, which is why a quick visual scan cannot replace item-by-item inspection. Inspect for cleanliness first. HSPA names the specific residues: organic matter in serrations, box locks, and lumens; adhesive left by tape or labels; bone cement on orthopedic instruments; and staining. Staining is worth reading correctly rather than just wiping away. Brown or orange stains are usually mineral deposits or oxidized residue rather than true rust, bluish-black discoloration often points to detergent or pH problems, a rainbow sheen suggests mineral deposits from water, and true pitting and corrosion mean the passive layer has been damaged and the instrument comes out of service. Anything that is not clean goes back to decontamination; it does not get wiped at the assembly bench and passed along, because a wipe does not reach what the washer missed. Then inspect for damage and test for function. Look for cracks, chips, worn or misaligned jaws and tips, loose pivot screws, stiff or sloppy hinges, and burrs. Functional testing is device specific. Scissors are tested by cutting the manufacturer-specified test material with the distal third of the blades, where dullness appears first, never by running a finger or fingernail along the edge. Needle holders must grip a suture needle without slippage or rotation. Ratcheted instruments are closed to the first ratchet and tapped, and a ratchet that springs open does not hold. Clamps and forceps are checked for jaw alignment and tip approximation, with the tips meeting evenly and no light visible between them when closed. Electrosurgical and laparoscopic instruments get an insulation test. Cannulated and lumened instruments are checked for patency and, where the equipment exists, inspected internally. Some device families need their own steps. Rigid endoscopes and optics are checked by looking through them toward a light source: a clear, undistorted image with no dark spots or crescents means the lens system and fiber bundle are intact, while a yellowed or dim image, a cloudy field, or visible black spots indicate broken fibers or a damaged lens. Powered handpieces, drills, and saws are inspected for cord and hose damage, tested for smooth operation, and lubricated only as their instructions direct. Microsurgical and ophthalmic instruments are inspected at higher magnification because their working tips are measured in fractions of a millimeter, and they are handled individually rather than in a pile. Instruments that fail are removed from service and sent for repair, tagged and documented so the count sheet reflects the missing item and the operating room is not surprised. Broken instruments are never returned to the set for now. The documentation matters more than it looks: a repair log that records which instruments fail and how often turns individual breakages into a pattern — a set that keeps returning with bent tips, or a scissor pattern that dulls faster than it should — and the pattern is what justifies replacement, a change in handling, or a conversation with the procedural area. Lubrication, where the instructions specify it, uses a water-soluble, steam-penetrable instrument lubricant applied after cleaning and before packaging. Petroleum-based oils, penetrating sprays, and industrial products are prohibited, because they form a barrier that blocks sterilant contact and can leave toxic residues.
Package Assembly
Assembly balances three goals at once: the set must sterilize reliably, arrive functional and complete, and be safe to handle. Count sheets drive the process. Each set has a standardized content list, and the technician assembles to it, verifying every item by name, size, and quantity rather than by recognizing the tray's general shape. The count sheet is also a communication document, so missing items are recorded on it and any substitution is documented rather than made silently. A count sheet that is out of date with the set it describes is itself a defect worth reporting, because every technician after you will assemble to it. Item identification is a real skill HSPA calls out, and it is harder than it sounds. Technicians use manufacturer catalogs, product and item numbers, etched or laser-marked identification, tracking-system records, and physical measurement to identify an unfamiliar instrument and to cross-reference a proposed substitute against the original. Two instruments can look identical in a photograph and differ only in overall length, jaw curvature, the pattern or fineness of the serrations, or whether the tip is toothed — differences that decide whether a surgeon can complete a step. Measuring is how you tell, which is why a ruler belongs on the assembly bench. Identification has a maintenance side too: instrument marking tape, where a facility uses it, is applied and replaced per its manufacturer's instructions and inspected each cycle, since loose or layered tape traps soil and blocks sterilant contact, and etching by any method the manufacturer has not approved can breach the passive layer and start corrosion. Instrument placement exists to let the sterilant in and keep the contents intact. Hinged instruments are placed open on stringers, racks, or instrument pins so steam reaches box locks and ratchets. Heavy items go on the bottom and delicate microsurgical and ophthalmic instruments go on top, protected with sterilant-permeable tip guards. Concave items such as basins and cups are positioned on edge or tilted so condensate drains rather than pools. Instrument protection devices — tip protectors, foam, mats, and tray liners — must be approved for sterilization, sized correctly, and must not block tray perforations or absorb so much moisture that they cause a wet pack. Absorbent towels used inside a tray are placed so they do not block steam circulation, and multi-part instruments are disassembled per their instructions so sterilant reaches mating surfaces. Weight is the last assembly rule. Total set weight is commonly kept to about 25 pounds including the tray and containment device, because heavy sets retain more condensate, dry poorly, and cause lifting injuries, and the weight is distributed evenly across the tray rather than concentrated at one end, which improves drying and keeps the tray from tipping when carried.
Chemical Indicators, Classes 1 Through 6, and Where They Go
Chemical indicators change color or form in response to one or more sterilization variables. HSPA places their class, type, placement, and intended cycle in this section rather than in sterilization, because the decision of which indicator to put where is made at the packaging bench. There are six classes, defined by what the indicator responds to. Class 1 process indicators, such as autoclave tape and the preprinted markings on a peel pouch, are external and only distinguish a processed package from an unprocessed one. Class 2 indicators are for use in specific tests, and the Bowie-Dick air-removal test is the example every technician must know. Class 3 single-variable indicators respond to one variable, usually temperature. Class 4 multi-variable indicators respond to two or more variables but not all of them. Class 5 integrating indicators respond to all critical variables and their performance is correlated to the stated values of a reference biological indicator, which is why they appear inside process challenge devices and in implant loads. Class 6 emulating indicators respond to all critical variables at the stated values of one specific cycle, so an indicator labeled for 270 degrees F and 4 minutes may be used only for that cycle. Placement follows two rules. An external indicator goes on the outside of every package, unless an internal indicator is visible through the packaging, and its only job is to let anyone who picks the package up see that it has been through a process. An internal indicator goes inside every package, in the location within that package hardest for the sterilant to reach — typically the center of a wrapped set or the deepest corner of a container — because that is the location whose exposure you actually need to know about. The indicator must also match the cycle it will run in. An indicator cleared for steam tells you nothing in a hydrogen peroxide chamber, and a Class 6 emulating indicator labeled for one cycle's stated values is invalid in a different cycle. No chemical indicator of any class replaces biological monitoring, and none of them proves sterility. If an internal indicator has not changed when a tray is opened, the tray is not used: it is returned for reprocessing and the load records and remaining packages from that cycle are reviewed. External tape changing color never overrides an internal indicator failure.
Packaging Systems: Wrap, Pouches, and Rigid Containers
Three packaging systems dominate: sterilization wrap, peel pouches, and rigid containers. Every one of them must allow sterilant in, keep microorganisms out after processing, permit aseptic presentation at the point of use, and survive normal handling and transport. The first question is always which sterilization method the package is going into, because high-temperature steam and low-temperature methods do not share materials. Cellulose-based wraps, paper pouches, muslin, and cotton absorb hydrogen peroxide and will abort a gas plasma cycle, so low-temperature loads require nonwoven polypropylene wrap and approved trays and pouches. Choose the packaging for the cycle before you choose it for convenience. Sterilization wrap is applied by the sequential method, using two separate wrappers one after another, or the simultaneous method, using a bonded two-ply wrapper applied once, which saves a step and reduces the chance of a fold error. Either method can use the envelope fold, with the wrapper set as a diamond and the near, side, and far corners folded in turn so the package unfolds away from the person opening it, or the square fold, with the wrapper set square to the tray and the near, far, and side edges folded in turn. In both, every fold gets a cuff or tab so the person opening the package can grasp it without reaching over the sterile contents. The wrap itself is inspected before use, held up to the light and checked for holes, thin spots, creases, and stains, since a barrier with a pinhole is not a barrier. It is applied snugly enough that the package holds its shape but without excessive tension, because a tightly stretched wrapper tears at the corners of a tray during handling, and it is secured with sterilization indicator tape — never with staples, pins, paper clips, rubber bands, or ordinary adhesive tape, which either puncture the barrier or fail to indicate processing. Nonwoven wrap has a grain direction and a defined barrier side, so follow the manufacturer's instructions on orientation and on the maximum tray size and weight each grade is validated for. Peel pouches are used for small, lightweight, single items. The pouch is sized so contents do not stress the seals and there is room for sterilant to circulate, the item is positioned so its handle presents first when the pouch is opened, and double pouching is done only when the pouch manufacturer validates it, with the inner pouch not folded and both facing the same direction. Never fold, cut, tape, or otherwise resize a pouch to make an item fit. Pouches are closed by heat seal or by the manufacturer's self-seal adhesive strip, and whichever closure is used, the seal must be continuous and complete across the full width. Rigid containers are a system of parts, and every part is inspected before every use. The filter, disposable or reusable depending on the design, must be the correct type for the container and the cycle, unused if it is single-use, and properly seated and secured by its retention plate, because a filter that has shifted leaves an open path into the container. Some containers use a valve instead, checked for free movement and a clean seat. The gasket in the lid must be continuous, soft, and fully in its channel, since a hardened, cracked, or displaced gasket will not seal. Latches must engage positively, handles and baskets must be intact, and the body and lid are checked for dents and warping because a dented rim will not mate. After assembly a tamper-evident lock is applied so the point of use can see the container has not been opened since processing. Containers are deliberately not airtight — sterilant must enter and air must leave — which is why seal it completely is always a wrong answer about a rigid container. Package inspection is the last step before the package leaves the bench: wrap checked for tears and secure closure, pouch seals checked end to end, containers checked for filter, gasket, valve, latch, and lock. A package that fails inspection is rebuilt, not patched. Two package types get extra attention here. Implant packages are built knowing they will be quarantined until a biological indicator reads negative, so they are labeled as implants and staged so nobody releases them early by accident. Loaner sets are the ones most likely to go wrong at this bench, because the technician is assembling an unfamiliar set from a vendor's inventory sheet rather than the facility's own count sheet: every item is verified against that sheet, the vendor's written instructions for that specific set govern the packaging and the cycle, and any discrepancy is raised before the set is packaged rather than discovered in the operating room.
Labeling
A sterilized package carries a label that lets a user select the right package without opening it and lets the department find that package again if something goes wrong. The information HSPA names is a description of the contents, the lot control number identifying the sterilizer, the cycle or load number and the date, the technician's identification, the storage destination or owning department, and a note of any missing items in the set. Special identifiers matter as much as the basics: a package containing an implant, a set that is loaned or vendor-owned, and the sterilization method or cycle the package requires are all flagged on the label, because each of those changes how the package is handled downstream. Two placement rules are heavily tested and easy to get backwards. On a peel pouch, write on the plastic side, outside the seal, because ink on the paper side can penetrate the porous material and reach the contents and writing across a seal compromises it. On a wrapped package, write on the indicator tape rather than on the wrapper, because ink applied directly to the wrap can wick through the barrier. Use only an approved labeling method — a felt-tip or other non-bleeding, non-toxic marker approved by the packaging manufacturer, a printed label, or an electronic labeling system — and never a ballpoint pen or pencil, which can score and perforate the material. Labeling is done before the package goes into the sterilizer, not afterward, since writing on a processed package means handling a sterile barrier with a pen and pressing on it. Increasingly the label is generated by an instrument tracking system rather than written by hand: the technician scans the set, the system prints a label carrying the lot control data and often a barcode, and the assembly is recorded against that technician automatically. The information required is the same either way; the tracking system simply makes the record legible, complete, and searchable, which is what a recall depends on.
Last updated: September 2026