Writing a TB laboratory guide for proficiency testing and corrective action

A TB lab guide to interpreting proficiency testing results and applying corrective actions gives bench staff, supervisors and quality managers a shared route from a returned panel to a documented change in practice. It should state who reviews each result, what evidence is required, who approves action and how completion is verified. The GLI Quality Tool offers a practical quality management framework for laboratories working across varied resources.

In Australia, the guide must work across different laboratory settings: metropolitan public health laboratories in Sydney and Melbourne, services in Perth and Cairns, and smaller units serving Alice Springs, Darwin and remote Northern Territory communities. A one-size-fits-all workflow will fail when staff, transport schedules, referral pathways, test volumes and operating conditions differ. Plain English, clear ownership and realistic timeframes matter more than a complicated diagram.

Tuberculosis testing involves smear microscopy, culture and, where available, molecular methods, each with its own quality risks. A proficiency testing panel can reveal problems with reagent handling, incubation, reading, reporting or interpretation, but it does not replace internal quality control, clinical review or direct patient care. The guide should keep these boundaries visible so that a poor performance result prompts investigation without causing inappropriate changes to treatment.

It should also recognise Australian terminology. Many laboratory teams speak of running quality control, signing off records, raising a non-conformance and closing the loop, while external quality assessment may be described as proficiency testing. State and territory tuberculosis programs, public health laboratories and Aboriginal and Torres Strait Islander health services may all contribute to local workflows. The finished guide should therefore be owned by the receiving laboratory and reviewed with the relevant reference laboratory and program.

Build the guide around the local laboratory

Begin with a one-page purpose and scope. Identify the tests included, the staff expected to use the guide, the proficiency testing provider and the applicable reporting rules. Define key terms such as acceptable result, non-participating result, inconclusive result, deviation, non-conformance, root cause and corrective action. Definitions should match the provider’s instructions and the laboratory’s quality management system rather than introduce a parallel set of labels.

Create a rapid escalation pathway for urgent findings. A result suggesting a serious missed detection or false-positive pattern needs prompt notification to the laboratory supervisor and designated quality lead, preservation of any remaining panel material where safe, and a check of related patient reports. Accredited laboratories should align the pathway with their NATA accreditation obligations and ISO 15189 requirements, while smaller services should use the applicable public health laboratory or reference laboratory agreement. Include out-of-hours contacts and a method for documenting verbal handovers.

Set document control from the start. Record the owner, approver, review date, version number and revision history, and archive superseded copies. Keep the guide accessible at the bench and usable during shift handovers. This is particularly important where specimens and reports move between a local hospital, an Aboriginal Medical Service, a remote clinic, a state public health laboratory and a referral laboratory.

Interpret the proficiency testing result correctly

Start each review with the provider’s report, instructions and scoring criteria. Confirm that the panel was accepted, stored and processed within the stated conditions, then transcribe the finding into a standard record. Separate the provider’s formal result category from the laboratory’s interpretation. In many schemes, “non-participating” means no report was returned, “unacceptable” or “inadequate” describes failed performance, and “inconclusive” can indicate an invalid or incomplete submission. The provider’s definitions must always take precedence.

Next, compare the result with earlier rounds, internal quality control, reagent records, instrument logs and relevant clinical quality indicators. A single unexpected value may reflect a clerical or transport issue, while repeated incorrect results point towards a process or competence problem. Trend charts should use plain labels, show consecutive cycles, and flag deterioration as well as isolated events. Keep the original provider report with the evidence; do not rewrite the finding as a pass merely because a repeat result improves.

Use the GLI Quality Tool’s phase four improvement resources to connect proficiency testing with the laboratory’s wider quality management system. The phase can support review of quality indicators, identification of gaps and planning of improvement activities. It is useful to link each external finding to internal data and risk assessment, but the guide should still record a clear decision: no further action, documented investigation, corrective action or escalation to a partner laboratory.

Apply corrective actions that change practice

Corrective action should address the demonstrated cause, not only the failed panel. First contain any immediate risk, such as quarantining implicated reagents, reviewing potentially affected reports or arranging confirmatory testing through a reference laboratory. Then use a structured root cause analysis. Ask what was expected, what happened, how the difference was detected, why existing controls did not prevent it and what would reliably stop recurrence. Avoid labelling a busy bench or an individual operator as the cause without examining workload, staffing, training, environment and equipment.

Translate the finding into a time-bound action plan. Each action needs a named owner, due date, resources, completion evidence and an effectiveness check. For example, a molecular-testing discrepancy might lead to a competency assessment, a changed reagent preparation instruction, a second-person review of invalid results and a review of recent reports. If specimen transport contributes, coordinate with the courier and collection service, document the handover points, and set an escalation rule for delayed or temperature-deviated consignments.

Share the outcome where it affects the wider service. In Australia, a finding in Darwin may need advice for services in remote communities, while a pattern in Perth may require notification to the relevant state tuberculosis program and national reference laboratory. Do not disclose proficiency testing material or provider scores as though they relate to identifiable patients. Close the loop only after evidence shows that the revised process has been implemented, monitored and sustained. A corrective and preventive action (CAPA) register should link the non-conformance, investigation, actions, effectiveness review and approval.

Recommendations for drafting and maintaining the guide

A useful drafting approach is to test the guide against realistic scenarios rather than beginning with a long policy. Ask a technologist to explain how they would handle a non-participating submission, a borderline reading, a failed isolation result and an out-of-hours notification. The answers will expose missing steps, ambiguous wording and unclear accountability.

• State the purpose and scope on the first page, including which tests, reporting pathways, staff and external partners are covered.
• Define every outcome used by the provider and explain what it means for follow-up, avoiding the assumption that all unsuccessful results have the same cause.
• Build a decision flow from receipt and acceptance through result review, containment, root cause analysis, action and effectiveness verification.
• Assign named roles for technical review, quality approval, patient-report impact assessment and communication with reference laboratories.
• Require evidence-based corrective actions with owners, due dates, linked risks, training needs and measurable checks of effectiveness.
• Review the guide after every significant proficiency testing event and on a scheduled cycle, incorporating workload, staffing, technology and referral changes.

Test the final document for accessibility. Avoid acronyms that are not explained, write “laboratory” rather than “lab” in formal instructions, and use plain English for people working across disciplines. Maintain a short glossary, an escalation contact sheet and a printable result-review form alongside the full guide. These supporting tools often prevent the main document from becoming too dense.

Turn the guide into a working quality system

Ownership is what turns a document into practice. Assign a guide owner and backup, schedule quarterly review of proficiency testing trends, and bring outcomes to the laboratory’s regular quality or management meeting. Record whether agreed actions were completed, whether errors or delays recurred, and what resources are needed next. This creates a defensible link between external quality assessment, internal quality control and patient safety.

Review capacity as well as compliance. If the corrective plan adds checks without accounting for bench time, prioritisation or sample flow, delays may simply move elsewhere. The laboratory workload analysis guide can help teams map activities, identify bottlenecks and test whether proposed actions are realistic in a metropolitan, regional or remote laboratory.

Start the next review cycle now: nominate the owner, collect the latest provider reports, map each result to its investigation and corrective action, and identify any overdue effectiveness checks. Circulate the revised guide to bench staff, supervisors, quality leads and partner laboratories, then record acknowledgement and the next review date. This is how the guide becomes an active control that supports reliable tuberculosis diagnosis in every Australian setting.