How to Set Up a Surgical Instrument Tray: Pack Organization

The scrub tech opens the pack fifteen minutes before the surgeon scrubs. In those fifteen minutes the entire back table has to go from a sterile-wrapped bundle to a logical, counted, ready-to-hand layout — hemostats grouped and racked, sharps isolated, the count reconciled with the circulator. Do it well and the case runs quiet. Do it badly and the surgeon waits, the count drags, and a sponge or needle goes missing.

Instrument tray setup is a skill, not a chore. Here is how it is done properly, from pack to close.

Before You Open Anything: Verify

Setup starts with verification, not unwrapping. Check three things on the outside of the pack first:

• Integrity — the wrap is intact, dry, and unbroken. A wet pack is a contaminated pack. Any tear, breach, or moisture and the tray is discarded, not used.
• Sterilization indicator — the external chemical indicator has changed to its pass state. The internal indicator is checked once opened.
• Identity and date — the tray label matches the scheduled procedure, and the load/expiry information is valid.

Only once those pass do you open. Open the outer wrap away from your body, maintaining the sterile field, and let the circulator confirm the internal indicator and the count sheet before the scrub person begins arranging.

The Logic of the Back Table

A back table is not arranged by aesthetics. It is arranged by sequence of use and class of instrument, so that any instrument can be found by feel and handed without searching. The standard grouping, from the scrub person’s dominant side outward:

1. Cutting and dissecting — scalpels, scissors (Mayo, Metzenbaum), kept together with sharps controlled on a magnetic pad or in a designated neutral zone.
2. Grasping and holding — tissue forceps, Allis, Babcock, Kocher, thumb forceps.
3. Clamping and occluding — hemostats (mosquito, Kelly, Crile), racked in order of size on a stringer or towel roll so they can be counted and drawn quickly.
4. Retracting and exposing — handheld and self-retaining retractors, laid at the top or far edge until needed.
5. Suturing — needle holders, suture, kept with a needle counter close by.
6. Accessory — suction tips, bowls, light-handle covers, drapes.

Hemostats are the workhorses and the counting headache. Racking them on a stringer or rolled towel — jaws aligned, tips the same direction — is what makes a fast, accurate count possible mid-case.

The Mayo Stand: Only What the Case Needs Now

The Mayo stand holds the instruments in immediate use for the current step, drawn from the back table and returned as steps change. Overloading the Mayo defeats its purpose. A clean Mayo carries a knife, the scissors in use, a couple of hemostats, tissue forceps, a needle holder loaded with suture, and suction — no more. As the case moves from incision to closure, the Mayo is refreshed from the back table.

The discipline here is one-way flow: instruments move from back table to Mayo to field and back, never piling up. A cluttered Mayo is where sharps get lost and counts go wrong.

The Surgical Count: The Non-Negotiable

Counting is where tray setup meets patient safety. A retained surgical item is classified as a preventable never-event, and the count is the primary defence against it. Counts are performed:

• Before the procedure (baseline, during setup),
• Before closure of a cavity,
• Before skin closure, and
• At any relief of the scrub or circulating nurse.

Sponges, sharps (needles and blades), and instruments are counted audibly and concurrently by the scrub and circulating nurse, and recorded. Any discrepancy stops the close — the field is searched, the count repeated, and imaging used if the item is not found. Setting the tray up in a countable arrangement from the start is what makes the closing count fast rather than frantic. Standardised count sheets tied to each tray’s known contents remove guesswork.

Standard Tray Composition

Every facility standardises its trays so that a “general major set” means the same thing every time. A representative general laparotomy tray illustrates the categories:

Procedure-specific trays build on this base. A cholecystectomy set, for example, adds gallbladder-specific clamps and dissectors to the general foundation. Standardising these named sets is what makes tray rationalisation — removing instruments no surgeon touches — possible, and rationalised trays are faster to set up and cheaper to reprocess.

Common Setup Errors That Slow a Case

Most delays trace back to a handful of avoidable habits. Overloading the Mayo stand is the commonest — it turns a quick hand-off into a search. Racking hemostats out of order, or with tips facing different ways, makes both the draw and the count slower. Leaving sharps loose on the field instead of in a controlled neutral zone invites needlestick injuries and lost needles.

Two structural mistakes cause the most trouble. The first is a non-standardised layout — if every scrub person arranges the table differently, no one can step in during a relief without relearning the field. The second is skipping the countable arrangement at baseline, which turns the closing count into a scramble. Good surgical tray setup is repeatable: the same instrument classes in the same zones, every time, so a relieving nurse reads the table instantly and the count reconciles without hunting.

New scrub staff benefit from photographing a correctly arranged standard set and using it as a reference until the pattern is second nature. Consistency, not speed, is what makes a setup fast.

After the Case: Setup for the Next Cycle

Tray setup does not end at close. How instruments are handled at the end of a case determines how the next tray is built. Instruments are kept moist, box locks opened, sharps separated, and the whole set sent to decontamination promptly — dried blood and saline are what pit and corrode steel. The tray then re-enters the reprocessing cycle: cleaning, inspection, assembly against the count sheet, wrapping, and sterilization. The complete journey is covered in our CSSD workflow guide.

Fizza Surgical manufactures the full range of general and procedure-specific instruments that make up a standard tray — forged to CE and ISO 13485 standards and built for repeated reprocessing. Explore the complete catalogue in our surgical instruments category.