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Microbiology Identification System
Manufacturer
Model
What This Guide Helps With
Use this guide when expected quality-control performance is unacceptable, inconsistent, or fails laboratory-defined acceptance criteria.
Step-by-Step Troubleshooting
1. Stop Patient Testing as Required
Do not rely on patient results from an analyzer whose required QC is unacceptable.
Laboratory personnel should follow their validated QC and alternate-testing procedures while Clinical Engineering investigates equipment-related causes.
Expected outcome: Patient testing is protected until QC performance is acceptable.
2. Confirm the Exact QC Failure
Determine:
- Which QC material or organism was used
- Which test or card type was affected
- Whether the result failed once or repeatedly
- Whether one result or multiple results are affected
- Whether another analyzer or method produced acceptable results
Record the exact observed result and system messages without interpreting laboratory acceptance criteria.
Expected outcome: The QC failure is clearly characterized.
3. Separate Laboratory Material Issues From Equipment Issues
Have laboratory staff verify:
- Correct QC material was selected
- Preparation followed the laboratory's validated method
- Material was stored and handled appropriately
- The correct consumables were used
- Material is within laboratory acceptance requirements
Clinical Engineering should not alter laboratory QC limits or override unacceptable results.
Expected outcome: Obvious QC material or preparation errors are ruled out.
4. Inspect Consumables and Loading Components
Inspect accessible cards, racks, carriers, labels, and loading areas for:
- Damage
- Contamination
- Incorrect seating
- Debris
- Recognition problems
- Mechanical interference
Expected outcome: Consumables and external loading components are intact and correctly positioned.
5. Verify Analyzer Status
Confirm there are no active analyzer faults involving startup, transport, recognition, temperature control, communication, or another condition that could affect testing.
Check for recent:
- Power interruptions
- Maintenance
- Relocation
- Cleaning
- Software or configuration changes
Expected outcome: The analyzer is in a stable and normal operating state.
6. Compare Results With a Known-Good Setup
When authorized, laboratory personnel can repeat QC using verified materials or compare performance with another validated instrument.
Clinical Engineering should observe whether the failure follows:
- The material
- A particular consumable
- A specific position
- The analyzer itself
Expected outcome: The comparison narrows the source of the QC problem.
7. Check Environmental and External Conditions
Verify ventilation is unobstructed and there is no obvious excessive heat, moisture, vibration, or power instability.
Do not assume an internal analytical fault until these conditions have been ruled out.
Expected outcome: No obvious external condition explains the QC failure.
8. Repeat QC After a Corrected External Cause
If a clear external cause has been corrected, laboratory staff should perform the required QC again using their established procedure.
Clinical Engineering should not declare the analyzer acceptable based solely on normal mechanical operation.
Expected outcome: QC returns to laboratory-defined acceptable performance.
If QC passes and the laboratory accepts the system, troubleshooting can stop.
9. Perform Final Verification
Confirm:
- No active equipment faults remain
- External components are operating normally
- QC has been accepted by laboratory personnel
- Any required post-service checks are complete
Expected outcome: The analyzer is technically functional and laboratory quality requirements are satisfied.
If the Problem Persists
If QC material handling, consumables, loading, analyzer state, external environment, and comparison testing have been evaluated, common external causes have been ruled out.
The remaining problem may involve an analytical, optical, sensor, incubator, transport, software, configuration, or other internal service-level condition.
The device should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate manufacturer documentation and approved test equipment
- Repaired or configured only by qualified personnel
Do not adjust internal parameters or acceptance criteria to make QC pass. Knowing when to stop external troubleshooting is proper troubleshooting.
The analyzer must meet required QC and post-service verification before return to patient testing.
Clinical Use Tip
QC acceptance belongs to the laboratory; Clinical Engineering should verify equipment performance without overriding laboratory quality controls.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Laboratory staff reported repeated unacceptable QC results on the bioMerieux VITEK 2 Compact."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found a damaged carrier that was not seating consistently during testing."
Resolution
What action was taken.
Example:
"Removed the damaged carrier from use, verified normal operation with an intact carrier, and laboratory staff repeated QC successfully before returning the analyzer to testing."
Helpful Details to Include (If Known)
- QC material used
- Test or consumable involved
- Whether failure was repeated
- Whether multiple positions were affected
- Consumable condition
- Rack or carrier condition
- Recent maintenance or power event
- Known-good comparison
- Analyzer alarms
- Environmental observations
- QC result after correction
- Laboratory acceptance status
Final Thought
Protect patient testing first, separate material and workflow issues from equipment problems, and never force acceptance of failed QC. Return the analyzer only after both technical and laboratory verification are complete.
That is successful troubleshooting.