Implementing a two-person review system for high-risk TB microscopy
A tuberculosis microscopy finding can lead to urgent treatment, contact investigation or clinical escalation. A TB laboratory two-person review system gives two competent staff members a shared checkpoint for examining the slide, source information and proposed report before release. It is a practical safeguard for consequential results.
The review supports rather than replaces the laboratory’s quality management system. It does not confirm tuberculosis on its own, determine drug susceptibility or substitute for culture, nucleic acid testing and clinical assessment. Its purpose is to reduce avoidable reporting errors and ensure critical findings are supported by competent, traceable review.
Australian laboratories must accommodate local realities. Public health and hospital services in Melbourne, Sydney and Brisbane often manage large, diverse metropolitan catchments, while specimens may cross state borders through a mixed public and commercial pathology market. State and territory TB notification requirements, privacy legislation and electronic laboratory information systems shape the service.
The GLI Quality Tool provides a four-phase roadmap based on twelve Quality Systems Essentials. That structure supports a controlled rollout: assess the current risk, plan responsibilities, test the process and strengthen it through improvement. The new control should connect with existing systems for laboratory safety, personnel, equipment, documentation, assessment and continual improvement.
Define high-risk microscopy results
Set local triggers according to the potential for harm, not simply whether a smear is positive. Candidate triggers include any positive acid-fast bacilli (AFB) smear, scanty or indeterminate findings, a negative smear that conflicts with strong clinical suspicion or previous evidence, compromised specimen quality, and disagreement with culture or molecular findings. Final criteria belong in an approved standard operating procedure.
Make review status visible in the laboratory information system so staff can see whether a result has been independently checked. Every high-risk result should have a recorded review category, reviewer identifiers and final authorisation. A result marked as awaiting review must not be released through an ordinary reporting pathway, although the procedure should define an urgent escalation route.
Teams can use the GLI Quality Tool’s phase-specific checklists to identify relevant Quality Systems Essentials and document the baseline. This turns “high risk” into an operational rule linked to the laboratory’s risk assessment, competency records, non-conformity process and corrective actions.
Map the review workflow
Map the pathway from specimen receipt to result authorisation. It should show request and patient identifiers, specimen type, collection details, slide preparation, staining quality control, primary microscopy, independent review, discrepancy resolution and electronic release. Each transition should have an accountable role, especially where errors involving labels, diluted specimens or incomplete requests can affect interpretation.
Set a review timing standard that protects accuracy without delaying urgent findings. The second person should examine the relevant slide and source records before seeing the primary reader’s provisional conclusion where practicable. Digital images may support review when image quality, magnification, focus and laboratory information are validated and accreditation requirements permit; otherwise, physical slide review should remain available.
Privacy controls must travel with the workflow. The Privacy Act 1988 (Cth), applicable state or territory health-records legislation and TB notification duties should be addressed in the procedure. Use role-based access and approved laboratory systems or teleconferencing tools, rather than consumer messaging applications, for patient-related discussions. After-hours shifts need a named backup reviewer and a defined method for contacting senior staff.
Establish reviewer roles and competence
Separate the functions of primary reader and second reviewer. Both must be authorised to assess smear findings within their competency, but the second person should form an independent view before results are discussed. A laboratory manager should own the policy, allocate staffing, resolve persistent disagreements and audit compliance. Reviewers must declare conflicts when they have participated in the specimen’s processing or have another material interest in the case.
Competency should cover specimen preparation, staining quality control, microscopy interpretation, reporting requirements, TB safety procedures and escalation. New reviewers need observed practical assessment, supervised cases and assessment of unresolved discrepancies. Competence should be reassessed periodically and after changes in staining methods, microscopes, reporting software or diagnostic algorithms. NATA accreditation against ISO 15189 can help structure this evidence for Australian medical testing laboratories.
Small and regional laboratories may not have two suitable staff members available on every shift. Establish a cross-site reviewer network or an authorised backup arrangement, while preserving independent review and direct access to the slide when required. Avoid designating the only available staff member as both reviewers, even when workload is high, because that removes the control’s independent challenge.
Standardise the review procedure
The standard operating procedure should define eligible results, authorised roles, review steps, response times, disagreement escalation, documentation fields and release authority. It should also state when repeat microscopy, culture, nucleic acid testing or clinical discussion is required. A positive AFB smear is an important finding, but the reporting decision should consider specimen quality, staining controls and the available clinical information.
| Review arrangement | How it works | Main advantage | Main limitation | Best role |
|---|---|---|---|---|
| Independent dual reading | Two authorised staff assess the slide and source data separately | Strong challenge to anchoring and catches errors early | Requires more staff time and coordination | Suspected false negatives and disputed findings |
| Independent second check | The primary reader records a provisional result; the second reviewer forms an own view before comparison | Clear ownership with independent confirmation | Needs a protected pause for the reviewer | Routine review of flagged results |
| Retrospective audit | A second person reviews released cases later | Low disruption to reporting | Cannot prevent the initial error | Trend monitoring and competency support |
Prefer an independent second check for routine flagged results and dual reading for particularly uncertain or disputed findings. Record disagreements rather than silently averaging them. The reviewers should repeat the examination, check specimen and quality-control information, and consult a third competent person when agreement cannot be reached. The final report should identify the authorised result and explain any limitation relevant to the clinician.
Keep an audit trail in the laboratory information system or approved paper register. Capture the primary and secondary observations, discussion, additional tests, agreed outcome, final authoriser, date and time of release. Retain sufficient evidence to demonstrate that the review occurred before the result became available to the treating team.
Pilot the system in daily practice
Begin with a limited pilot in one laboratory, shift or service. Define the number of flagged cases, review response time and expected staffing before go-live. Examine recent high-risk reports to establish a baseline for turnaround time, discrepancies, repeat testing and missed notifications. Use that baseline to identify practical obstacles such as unavailable reviewers, incomplete clinical information or software that does not capture review status.
Training should use realistic smear examples, common error scenarios and clear escalation pathways. Reviewers need to practise recording an independent interpretation before seeing another person’s conclusion. The GLI Quality Tool’s practical downloads can be reviewed alongside the local procedure to identify material for briefing sessions, competency evidence and workplace reminders.
Run the pilot long enough to observe routine operations, including absences and peak workload. Hold brief team huddles to discuss unresolved cases without identifying patients unnecessarily, and provide rapid access to the laboratory manager. After the pilot, compare performance with the baseline and seek feedback from microscopy staff, clinicians and specimen collection teams. Adjust the procedure before expanding it across sites.
Monitor performance and support improvement
Monitor the proportion of eligible results reviewed before release, turnaround time, disagreement frequency, repeat microscopy, culture or molecular escalation, missed notifications and reviewer workload. Stratify results by site and shift to expose problems that an overall percentage can conceal. Record near misses and recurring error patterns through the laboratory’s non-conformity and corrective-action process.
Visible feedback sustains attention. The guide on documenting small quality wins can help teams record improvements such as complete review fields, faster discrepancy resolution or consistent use of the escalation pathway. These records provide evidence of continual improvement and help new staff understand the control’s purpose.
Review the high-risk criteria, procedures and reviewer roster at defined intervals and after significant incidents. Changes in TB epidemiology, diagnostic methods, reporting systems or staffing should prompt an earlier assessment. Keep the review proportionate: strong data and clear accountability are more useful than adding forms that staff cannot complete accurately during busy microscopy sessions.
Recommendations for a reliable rollout
The following actions support a two-person review arrangement that remains workable, independent and connected to the laboratory’s wider quality management system.
- Define each flagged result, responsible reviewer, backup reviewer and maximum response time in an approved procedure.
- Preserve an independent second opinion before reviewers compare conclusions, and escalate unresolved differences to a third competent person.
- Integrate review fields with the laboratory information system, quality-control records, competency evidence and notification procedures.
- Pilot the control with baseline data, reviewer feedback and clear measures of turnaround time, discrepancies and workload.
- Audit completed reviews regularly, document corrective actions and recognise improvements that strengthen routine practice.
A review is dependable when staff can explain why a result was selected, who checked it, how disagreement was resolved and where the evidence is stored. Standard forms, concise training and visible follow-up reduce variation between shifts and laboratories. Regular feedback also helps the laboratory adapt the control as diagnostic methods and service demands change.
Start this week by assigning an implementation lead and holding a team huddle within five working days. Confirm the flagged-result definition, appoint primary and backup reviewers, select the pilot location and schedule a baseline review of recent high-risk reports. Record those decisions in the quality management system and begin the pilot with a firm review date.