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What This Guide Helps With
Troubleshooting failed calibration, failed QC, or poor assay recovery by checking reagents, consumables, sample handling, and analyzer status first.
Step-by-Step Troubleshooting
Ensure Patient Safety First
Confirm whether patient testing is currently being performed on the ADVIA Centaur XP / XPT.
If calibration or QC is failing, do not allow affected assays to be used for patient result reporting until QC acceptance criteria are met.
Expected outcome: Patient results are not released from an assay system that has not passed required quality checks.
Confirm the Exact Failure
Review the reported issue with the laboratory staff.
Determine whether the problem involves:
- Calibration failure
- QC failure
- Poor assay recovery
- One specific assay failing
- Multiple assays failing
- Intermittent QC shifts
- Reagent pack issue
- Recent lot change
- Recent maintenance or service activity
Expected outcome: The issue is narrowed to a specific assay, reagent lot, calibration event, or system-wide performance concern.
Check Assay Status Before Making Changes
Review the analyzer status, assay status, reagent status, and any active error messages.
Confirm whether the affected assay is disabled, expired, out of calibration, missing required reagent, or flagged by the system.
Expected outcome: Obvious software, reagent, or assay status issues are identified before deeper troubleshooting begins.
Verify Reagent Pack Condition and Loading
Confirm the correct reagent pack is loaded for the affected assay.
Check that the reagent is not expired, empty, improperly seated, or outside onboard stability limits.
Inspect for visible issues such as leakage, foam, bubbles, clots, or improper mixing if observable without opening internal assemblies.
Expected outcome: The analyzer has valid, properly loaded reagent available for the affected assay.
If replacing or reseating the reagent resolves the issue and QC passes, document the action and stop.
Confirm Calibrator and QC Material Handling
Verify that calibrators and QC materials are correct for the assay and lot in use.
Check expiration dates, storage conditions, reconstitution requirements, thawing requirements, mixing, and time at room temperature.
Confirm the correct material was placed in the correct sample position or rack location.
Expected outcome: Calibration or QC failure is not caused by expired, mishandled, or misidentified material.
Check Sample Cups, Racks, and Volumes
Confirm that the calibrator, QC, or recovery sample has sufficient volume for the requested test.
Inspect sample cups or tubes for bubbles, foam, clots, fibrin, evaporation, or incorrect cup type.
Expected outcome: The analyzer can aspirate a valid sample without volume or sample integrity problems.
Review Recent Lot or Assay Changes
Ask whether the failure started after a new reagent lot, calibrator lot, QC lot, assay file update, or calibration adjustment.
Confirm that the lot information entered in the system matches the physical reagent, calibrator, and QC material being used.
Expected outcome: Lot mismatch or incorrect assay setup is ruled out before suspecting analyzer hardware.
Check Environmental and Utility Conditions
Verify that the analyzer area is stable and appropriate for operation.
Check for obvious environmental concerns such as room temperature extremes, recent power events, vibration, nearby construction, or liquid spills.
Confirm the analyzer is connected to proper power and that any required UPS or power conditioning equipment is operating normally.
Expected outcome: Assay recovery problems are not being caused by unstable external conditions.
Review Maintenance Status
Check whether daily, weekly, or scheduled maintenance is overdue.
Confirm that routine cleaning, probe care, cuvette or waste handling, wash fluid checks, and system preparation steps were completed according to site procedure.
Expected outcome: Calibration or QC failure is not related to missed routine maintenance.
Check Consumables and Fluids
Verify that required fluids, wash solutions, water supply, waste containers, cuvettes, tips, and other consumables are present and within acceptable status.
Look for low fluid warnings, waste full warnings, blocked tubing indicators, or supply-related system messages.
Expected outcome: The analyzer has the required fluids and consumables to perform accurate aspiration, washing, incubation, and detection.
Repeat Calibration Only After Correcting Obvious Causes
If the issue appears related to a specific assay, reagent pack, calibrator, or QC material, correct that issue before repeating calibration.
Run calibration according to laboratory procedure using valid materials.
Expected outcome: Calibration completes successfully and the assay becomes available for QC testing.
If calibration passes and QC is acceptable, return the affected assay to service per laboratory policy and stop.
Run QC After Calibration
After successful calibration, have the laboratory run required QC levels for the affected assay.
Confirm whether QC results fall within the laboratory’s established acceptable range.
Expected outcome: The assay is verified before patient testing resumes.
If QC passes, the issue is resolved.
Compare Scope of Failure
If QC or recovery still fails, determine whether the issue is limited to one assay or affects multiple assays.
If one assay is affected, suspect assay-specific reagent, calibrator, QC, lot, or assay file issues.
If multiple unrelated assays are affected, suspect a broader analyzer, sample handling, fluidics, wash, incubation, detection, or environmental problem.
Expected outcome: The failure is classified as assay-specific or system-wide before escalation.
Check for Obvious Analyzer Performance Clues
Listen and observe during operation from a safe external position.
Note unusual sounds, repeated sample aspiration errors, probe errors, wash errors, reagent handling issues, cuvette handling problems, or recurring system alarms.
Expected outcome: Any external signs of mechanical, fluidic, or detection-related failure are documented for service.
Do Not Release Patient Results Until QC Is Acceptable
If calibration, QC, or assay recovery remains unacceptable, keep the affected assay unavailable for patient reporting.
Do not override failed QC or release results from an affected assay unless laboratory leadership follows approved downtime or exception policy.
Expected outcome: Patient result integrity is protected.
If the Problem Persists
If reagent, calibrator, QC material, sample handling, lot setup, fluids, consumables, maintenance status, and environmental conditions have been checked and the issue remains, common external causes have been ruled out.
The problem may involve internal analyzer systems such as sampling, reagent handling, wash performance, incubation control, detection, calibration data handling, or other service-level components.
The affected analyzer or assay should be:
- Removed from patient result reporting as appropriate
- Labeled Out of Service if analyzer-wide performance is affected
- Escalated for Siemens service or qualified bench evaluation
- Documented with assay name, lot numbers, error messages, calibration results, QC results, and recent changes
Knowing when to stop is proper troubleshooting. Repeated calibration attempts without correcting the underlying cause can waste reagents and delay patient care.
Clinical Use Tip
Do not troubleshoot calibration, QC, or assay recovery problems while patient results are being actively released from the affected assay. Place the assay or analyzer in a safe status first, move patient testing to a backup device or approved downtime workflow if needed, and coordinate with laboratory leadership before returning it to service so therapy continuity and patient result integrity are protected.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Laboratory reported repeated QC failures on the ADVIA Centaur XPT TSH assay after calibration."
Cause
What was observed during troubleshooting.
Example:
"Verified affected assay had a recently changed reagent lot; reagent pack and QC material were checked, and QC remained out of range after repeat calibration."
Resolution
What action was taken.
Example:
"Removed affected assay from patient reporting, documented reagent and QC lot information, and escalated analyzer for Siemens service evaluation."
Helpful Details to Include (If Known)
- Assay name affected
- Calibration date and result
- QC level or levels affected
- QC direction of failure, high or low
- Reagent lot number
- Calibrator lot number
- QC lot number
- Expiration dates checked
- Reagent pack replaced or reseated
- Sample cup or rack issues found
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Error messages or analyzer flags
- Maintenance status
- Fluid and consumable status
- Recent lot, assay file, or maintenance changes
- Whether one assay or multiple assays were affected
- Final analyzer or assay status
Final Thought
Calibration, QC, and recovery issues should be handled with a patient safety mindset. Start with the easiest external causes: materials, lots, expiration dates, sample handling, reagents, fluids, consumables, and maintenance status. If the issue continues after these checks, escalate appropriately and document the failure clearly so service can identify whether the problem is assay-specific or analyzer-wide.
That is successful troubleshooting.