GLI GLI Quality Tool
GLI Quality Tool — Version 2.0

How to Implement a TB Lab Equipment Critical Spare Parts Inventory List

A reliable tuberculosis laboratory depends on equipment that performs consistently when specimens, cultures and molecular tests are waiting. A failed centrifuge, biosafety cabinet, thermocycler or incubator can interrupt testing, delay clinical decisions and create additional pressure on staff. A critical spare parts inventory gives the laboratory a practical way to reduce that risk.

The aim is not to store every component for every instrument. It is to identify the parts most likely to stop a service, set sensible stock levels and make sure replacement items are available, traceable and suitable for the equipment in use. This approach supports continuity while avoiding expired, obsolete or incorrectly specified stock.

Australian laboratories may have different requirements from a large metropolitan service. A TB laboratory in Melbourne or Sydney may have several suppliers nearby, while a service supporting Darwin, regional Queensland or Western Australia may face longer freight times and fewer engineering visits. A well-maintained inventory accounts for these operating conditions.

The process also fits within a broader quality management system. The GLI Quality Tool’s roadmap connects equipment control with documentation, personnel competence, safety, assessment and continual improvement. Spare parts should therefore be managed as a controlled laboratory activity rather than as an informal collection of items in a cupboard.

Define Which Equipment Is Critical

Begin with an equipment register covering every instrument used in TB testing, specimen preparation, containment, incubation, identification and reporting. Include the asset number, manufacturer, model, serial number, location, installation date, service provider and current status. Record equipment that supports testing indirectly, such as refrigerators, freezers, uninterruptible power supplies and temperature monitoring devices.

Criticality should reflect the effect of failure on patient care and laboratory safety. A biosafety cabinet may be critical because it protects staff and prevents contamination. A real-time PCR platform may be critical because its failure stops rapid testing. A backup refrigerator may have a lower risk rating if validated alternative storage is immediately available.

Use a simple scoring method that considers service impact, likelihood of failure, time to obtain a replacement and the availability of an alternative instrument. The spare parts guide provides a useful framework for linking critical equipment to the parts required to keep it operational.

Map Failure Modes And Essential Components

For each high-risk instrument, consult the manufacturer’s service manual, maintenance agreement and fault history. Speak with biomedical engineers and experienced users about components that commonly fail or cause extended downtime. Typical examples include centrifuge lids and buckets, rotor seals, pump tubing, filters, fuses, batteries, fan assemblies, temperature probes, printer parts and power supplies.

Separate consumables from genuine spare parts, while tracking both where a shortage could interrupt testing. A cartridge, reaction plate or filter may be used routinely, whereas a replacement motor or sensor may sit in reserve. The inventory should make that distinction clear so that staff do not mistake routine stock for an emergency repair component.

Record the approved part number, compatible model, manufacturer, description, quantity held, storage conditions and supplier. Where a substitute is acceptable, document the approved alternative and the verification required before use. An unverified substitute can affect temperature control, electrical safety, contamination prevention or test performance.

Set Stock Levels For Australian Operating Conditions

A minimum and maximum level is more useful than an arbitrary quantity. The minimum should cover expected use during the supplier’s lead time, plus a safety margin for urgent demand. The maximum should reflect shelf life, storage space, capital cost and the possibility that the equipment will be retired.

Lead times in Australia can vary considerably. A metropolitan laboratory may receive a common fuse or tubing set quickly from a local distributor, while a specialised part may need to come from Europe or the United States. Freight to Perth, northern Queensland or the Northern Territory can add time, and wet-season disruptions, bushfires or flooding may affect delivery routes.

For each item, consider whether the laboratory needs one complete replacement, a repair kit or several small components. A critical pump assembly may justify shared regional stock, while inexpensive seals may be held at each site. Agreements between public health laboratories can provide a practical backup when equipment is compatible and transport conditions are controlled.

Stock Decisions That Support Continuity

Use the following checks when assigning a stock level:

A spare part should be protected from the same environmental threat that could damage the equipment. Store temperature-sensitive items in monitored conditions, keep electrical components dry and prevent dust or chemical exposure. Apply a first-expiry, first-out approach where shelf life applies.

Make The Inventory Traceable And Controlled

A spreadsheet can be suitable for a small service if it is protected, backed up and reviewed. Larger laboratories may use a maintenance or enterprise asset management system. The method matters less than the controls: authorised editing, version history, access permissions and a clear record of stock movements.

Each transaction should show what was received, issued, returned, discarded or transferred. Include the date, quantity, user, equipment identifier and reason for use. When a part is fitted, link it to the maintenance record and record any post-repair checks. This evidence helps demonstrate that equipment remains fit for purpose.

Assign responsibilities across laboratory management, procurement, stores and technical staff. A laboratory manager may approve criticality and budget, a stores officer may check quantities and expiry dates, and a biomedical engineer may confirm compatibility. The person ordering a part should have access to the current approved specification.

Align Procurement With Quality And The Local Market

Procurement should favour authorised suppliers and documented technical support. Ask vendors about genuine parts, compatible alternatives, warranty conditions, expected lead times and emergency service coverage. Australian distributors may support major brands in Sydney, Melbourne, Brisbane or Adelaide, while specialist manufacturers may use interstate or overseas supply chains.

Check whether the part is affected by electrical, medical device or safety requirements. Equipment used in an accredited laboratory must be maintained according to manufacturer instructions and local quality procedures. NATA-accredited services should retain evidence that repairs, calibration and verification are controlled. Where a component changes instrument performance, define acceptance testing before the instrument returns to routine work.

Budgeting should include more than the purchase price. Consider freight, customs, storage, service call-out fees, calibration and disposal. A low-cost component that arrives late can be more expensive than a higher-priced item held through a dependable local arrangement. For remote services, consider a consolidated order schedule and a defined escalation route for urgent breakdowns.

Integrate Parts With Maintenance And Safety

Preventive maintenance records should show which spare parts are due for planned replacement and which are held for unexpected failure. Review service reports for repeated faults. If the same fan, seal or sensor fails several times, investigate the underlying cause rather than repeatedly replenishing the item.

Repairs must be performed by authorised or competent personnel. Before work begins, isolate electrical equipment, follow biosafety procedures and decontaminate instruments where required. A centrifuge, cabinet or analyser may present mechanical, electrical or biological hazards even when the immediate task appears simple.

After installation, verify the equipment against defined criteria. Depending on the instrument, this may include temperature mapping, rotor inspection, alarm testing, calibration, leak checks, contamination control checks or comparison with known controls. Document who performed the work, what was changed and whether the equipment was released for testing.

Use Two Lists To Keep The System Practical

A critical parts list should remain easy to read during an urgent equipment failure. Separate items held on site from items available through a supplier, shared service or regional partner. This prevents staff from assuming that an item is immediately available when it is only listed in a catalogue.

A clear inventory record should include these core fields:

Review performance as well as quantity. A monthly check may suit frequently used or short-life items, while quarterly review may be adequate for stable, low-use components. The review should compare stock records with physical counts and confirm that packaging, labels and storage conditions remain acceptable.

Track the following indicators during quality meetings:

Review, Test And Improve The Inventory

At least annually, reassess the inventory against changes in testing volume, instrumentation, supplier arrangements and laboratory risk. Review it sooner after a major failure, new platform installation, relocation or change in referral pathways. A TB service may add molecular testing, alter culture capacity or rely on a new automated system, all of which can change critical spare requirements.

Include staff who use the equipment every day. Their experience can reveal practical problems, such as a part that is technically available but stored in the wrong building, or a replacement kit that lacks a small connector needed for installation. Feedback from procurement and engineering teams can expose supplier delays or discontinued components.

The GLI Quality Tool offers broader quality management guidance that can help laboratories connect this activity with equipment management, document control, assessment and improvement. Use audit findings and incident reviews to update the register, revise stock levels and strengthen contingency arrangements.

A mature system is visible in routine practice: staff can find the current list, identify the correct part, obtain approval, record its use and confirm that the instrument is safe to return to service. Establish the register, assign ownership and review the first critical equipment group this month so that spare parts become a dependable part of TB laboratory continuity planning.