White Paper

Cost-Benefit Analysis of Outsourcing Sterilisation Services vs. In-House CSSD in Australian Healthcare

October 2026

Disclaimer

This content is provided for information only. The authors make no representation or warranty regarding the accuracy, completeness or currency of the content. No information in this whitepaper should be construed as medical advice. Readers should seek appropriate professional guidance before acting on any information contained in this document. The authors expressly disclaim all liability for any direct or indirect loss or damage arising from the use of or reliance on this information.

Introduction

Hospitals and day procedure centres can reprocess reusable medical devices (RMDs) in an in-house central sterile services department (CSSD) or contract an external provider to collect, reprocess and return them. AS 5369:2023, which superseded AS/NZS 4187:2014 and AS/NZS 4815:2006, applies to both. This paper compares the two on equivalent annual cost, logistics, turnaround and risk controls, and gives a break-even outsourcing fee for a large hospital and a day surgery.

Financial Model Comparison

Method: Compare options on equivalent annual cost (EAC) in constant dollars at a real discount rate. Spread each capital item over its own life with the capital recovery factor, add annual operating costs, and divide by annual trays to give cost per tray. Exclude sunk costs, and include only costs that differ between the options. Calculate the all-inclusive provider fee at which the options cost the same, and compare quoted fees with it on the same tray or instrument basis. Comparing 10 year cash totals overstates the in-house cost, because building works last longer than 10 years.

Large hospital model: The following illustrative model uses 25,000 procedures per year on 260 operating days and a 5 % real discount rate. Replace each input with measured data, e.g. trays per procedure and process times from the instrument tracking system, and with quoted prices.

Running cost basis: Consumables are A$4.10 per tray: wrap or container filter A$2.50, chemical indicators A$1.00, tracking label A$0.20, and detergent and lubricant A$0.40, at illustrative unit prices. Washer-disinfector utilities are A$2.89 per cycle: 120 L [32 US gal] of water, and 7.6 kWh to heat 30 L [8 US gal] to 55 deg C [131 deg F] and 30 L [8 US gal] to 90 deg C [194 deg F] from 15 deg C [59 deg F], heat 60 kg [132 lb] of chamber and load steel to 90 deg C [194 deg F], and dry the load. Steriliser utilities are A$4.16 per cycle: 15 kg [33 lb] of steam requiring 11.1 kWh, and 165 L [44 US gal] of water. Tariffs are A$0.30 per kWh and A$5 per kL [A$18.93 per 1,000 US gal]. Cycle counts assume 85 % average load. Maintenance is A$12,000 per machine per year (four planned visits at A$2,250 and annual requalification at A$3,000), plus A$70,000 for water treatment, water testing, tracking system support and calibration, and A$10,400 for 1,040 daily air removal test packs at A$10.

Illustrative in-house equivalent annual cost. Totals may differ from the sum of rounded values.

Costs retained when outsourcing: Outsourcing does not remove all on-site cost. Include the following:

• Staff: 3 min per tray for receipt inspection, point-of-use pre-treatment checks and packing for transport, 2.9 FTE, plus 1.0 FTE for contract and quality management. 3.9 FTE costs A$374,000 per year.
• Additional trays: only set types used more often than the outsourced turnaround need duplicates. With half of daily trays in that group and 1 additional day of turnaround, 192 trays are needed, plus 10 emergency sets held on site. 202 trays at A$5,000 over 10 years cost A$131,000 per year.
• Receipt and holding area works: A$0.3M over 30 years, A$20,000 per year.

Retained costs total A$525,000 per year, or A$5.25 per tray.

Break-even fee: Outsourcing costs less where the all-inclusive fee is below A$4.64M per year. This is A$46.39 per tray, A$0.93 per instrument or A$186 per procedure. At a quoted A$40 per tray, outsourcing is A$639,000 per year lower. At A$45, it is A$139,000 lower. At A$50, in-house is A$361,000 lower.

Adjustments:

• Fee escalation: a fee rising 2 % per year above inflation over a 10 year term has a levelised value 8.6 % above the starting fee. Divide the break-even fee by the levelisation factor, giving a starting fee of A$42.70 per tray.
• Transition costs: levelise one-off costs, e.g. staff redeployment or redundancy, contract establishment and decommissioning, over the contract term. A$1M over 10 years at 5 % adds A$129,500 per year, or A$1.30 per tray, to the outsourced option.
• Sunk costs: where the CSSD building already complies, remove building works. The break-even fee falls to A$42.48 per tray.
• Space: where outsourcing releases floor area for clinical use, add the annual value of that use to the in-house cost.
• Tray definition: providers price per tray, per container or per instrument. Convert quotes to the facility's instrument count and set mix before comparison.

Sensitivity: Staff is 70 % of in-house cost, so labour productivity and staff cost dominate the result. Utilities are 1 % and do not affect the decision.

Measure process labour per tray from tracking system time stamps before tendering. A 20 % difference in labour productivity moves the break-even fee by about A$6 per tray, the largest effect of any single input.

Day surgery model: 1.5 trays per procedure, 250 operating days and 32 min of process labour per tray. Staffing is the greater of workload and minimum cover of one technician for 10 h per day, plus 0.5 FTE for the competent person in charge. Capital is a A$400,000 room fit-out over 30 years and A$250,000 of equipment (one washer-disinfector and two sterilisers) over 10 years, with A$29,000 per year of maintenance and testing, A$4.10 per tray of consumables and A$2 per cycle of utilities. Retained costs when outsourcing are 3 min per tray plus 0.1 FTE of contract liaison, and duplicates for half of daily trays at A$3,000.

Below about 3,000 procedures per year, minimum staffing cover sets the cost, so in-house cost per tray rises steeply as volume falls. At higher volume, in-house cost per tray approaches the large hospital value. Outsourcing is most likely to pay at low volume.

Transport and Logistics Considerations

In-house: Internal transport moves used devices from theatre to the CSSD and sterile items back. The hospital controls the schedule and can reprocess an urgent tray the same day.

Outsourced: A typical contract collects used devices after the list and returns them the next morning. Plan inventory on that basis: for each set type used more often than the outsourced turnaround, additional sets equal uses per day multiplied by the additional days of turnaround. AS 5369:2023 requires the total reprocessing time to be included in operational planning so that sufficient devices are available.

Time to cleaning: Delay between point-of-use pre-treatment and cleaning increases bioburden and lets soil dry on devices. Pre-treat at the point of use per the device instructions for use (IFU), keep devices moist where the IFU permits, and set a maximum time from use to cleaning that the provider's validated cleaning process covers.

Transport requirements: AS 5369:2023 requires transport procedures that protect devices, personnel and the environment, a risk assessment for transport between sites, and documented conditions under which transported devices are nonconforming. Specify:

• Rigid, robust, leak-proof, sealable, labelled and cleanable containers for used devices.
• Physical segregation of used and sterile loads in the vehicle.
• Compartment temperature and humidity limits set by the risk assessment, referenced to the sterile storage range of 18 to 25 deg C [64 to 77 deg F] and 35 % to 70 % relative humidity.
• Dispatch and receipt records for every container, with inspection of every pack on receipt.
• Reassessment of the need for revalidation when the transport route or means changes.

Contingency: Hold emergency sets on site for unplanned procedures, define the provider's response time for urgent runs, and agree backup routes and a second processing site. Immediate-use sterilisation is not a contingency for inventory shortfall: AS 5369:2023 prohibits its routine use where insufficient devices are available or as a cost-saving measure.

Operational Efficiency and Turnaround Times

In-house: Turnaround is set by CSSD capacity and staffing. Size washer-disinfectors and sterilisers for peak demand plus at least one unit of redundancy for maintenance, requalification and breakdown. A CSSD running near full capacity delays instruments at every demand peak.

Outsourced: A multi-client facility can run continuously and pool demand from several hospitals. Turnaround is set by the collection schedule, so processing speed at the provider does not shorten it. Same-day reprocessing requires an additional run at contract rates.

Performance indicators: Specify and report monthly:

• Turnaround time from collection to delivery, by priority class.
• Trays delivered complete and on time.
• Nonconforming items found on receipt: soil, damage, missing items, wet or damaged packs.
• Process failures, recalls and their root causes.
• Procedures delayed or cancelled for instrument reasons.

Instrument knowledge: Complex sets need assembly to surgeon and IFU requirements. Supply the provider with current set lists, IFUs and photographs for every set, and notify new devices before first use so the provider can confirm it can process them, including any low temperature process.

Hybrid model: A hospital can outsource high-volume routine sets and retain on-site capacity for urgent, specialised or low-volume devices. The retained capacity must meet AS 5369:2023 in full, so cost it as a second reprocessing facility.

Risk Profile Analysis

Method: Rate the likelihood and consequence of each risk with the organisation's risk matrix under AS ISO 31000, using local data where available. The same patient safety risks apply to both models. The controls and the party that applies them differ.

Accountability: The health service remains accountable for devices used on its patients. NSQHS Standards Action 3.17 requires reprocessing consistent with national and international standards and a traceability process for critical and semi-critical devices that identifies the patient, the procedure and the devices used. Australian Commission on Safety and Quality in Health Care Advisory AS24/01 required a gap analysis against AS 5369:2023 by 30 June 2025 and a compliance plan with timeframes.

Contract: AS 5369:2023 requires an agreement for outsourced activities that defines each party's responsibilities, including conformance to the standard. Include evidence of accreditation, audits or other quality activities, right of access to the provider's facility and records, performance indicators with remedies, nonconformance and recall notification times, business continuity arrangements, and exit provisions.

Provider failure: A hospital that has closed its CSSD cannot rebuild compliant capacity quickly. Before outsourcing all reprocessing, confirm the provider's second processing site or an alternate provider agreement, and retain staff with reprocessing expertise to audit the provider and manage any transition.

Conclusions and Recommendations

Neither model is cheaper in all cases. The decision turns on the quoted all-inclusive fee against the in-house equivalent annual cost, the state of the existing CSSD, procedure volume and the hospital's tolerance for next-day turnaround. In the illustrative large hospital, outsourcing pays below about A$46 per tray (A$186 per procedure), and staff productivity is the dominant input. In the illustrative day surgery, it pays below A$45 to A$119 per tray depending on volume, because minimum staffing cover sets in-house cost at low volume.

• Cost the in-house option fully: Include building and equipment capital recovery, staff, consumables, utilities, maintenance, validation and water testing.
• Cost the outsourced option fully: Include the fee schedule with surcharges and indexation, additional trays, retained staff, emergency sets and contingency arrangements.
• Calculate the break-even fee per tray from measured trays per procedure and process labour per tray, and test it against staff cost, volume and fee escalation.
• Plan logistics to AS 5369:2023: Transport risk assessment, specified containers, point-of-use pre-treatment, maximum time to cleaning and inspection on receipt.
• Contract for control: Performance indicators, audit rights, traceability data, continuity arrangements and exit provisions.
• Pilot before full transfer: Outsource one service line first and confirm turnaround, inventory and nonconformance rates before transferring the rest.
• Large hospitals: Retain in-house reprocessing where the CSSD is compliant or the quoted fee exceeds the break-even fee. Consider outsourcing or a hybrid model where a major rebuild is due.
• Day surgeries: Outsource where volume is low and the quoted fee is below the break-even fee. Designate a competent staff member to manage the contract and inspect incoming packs.

Sources

1. Standards Australia. AS 5369:2023 Reprocessing of reusable medical devices and other devices in health and non-health related facilities.
2. Australian Commission on Safety and Quality in Health Care. National Safety and Quality Health Service Standards, Action 3.17 Reprocessing of reusable equipment and devices.
3. Australian Commission on Safety and Quality in Health Care. Advisory AS24/01 Requirements for reprocessing of reusable medical devices in health service organisations, November 2024.
4. Standards Australia. AS ISO 31000:2018 Risk management, Guidelines.
5. IEC 60300-3-3 Dependability management, Part 3-3: Application guide, Life cycle costing.