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What This Guide Helps With
Troubleshooting DxU 850 Iris sample aspiration, probe clog, low flow, specimen pickup, or fluid path issues before repair escalation.
Step-by-Step Troubleshooting
Ensure Patient Safety First
Confirm the DxU 850 Iris is not actively processing patient specimens before opening covers, handling racks, checking fluid areas, or initiating cleaning.
Expected outcome: Patient testing is not interrupted, and no questionable urine microscopy results are released.
Stop Additional Sample Processing
Ask laboratory staff not to load additional racks or specimens until the aspiration or clog issue is understood.
Confirm whether any specimen was in process when the issue occurred and whether results were completed, flagged, rejected, or require repeat testing per lab policy.
Expected outcome: Incomplete or unreliable urine results are not reported.
Confirm the Exact Complaint
Ask staff what they observed. Check whether the issue involves:
- Sample aspiration error
- Probe clog message
- Low sample volume
- Missed sample pickup
- Air in the sample path
- Frequent repeats or flagged results
- Probe contacting the wrong area
- Abnormal noise during aspiration
- Issue after a specific specimen type or rack
Expected outcome: The issue is confirmed as aspiration, probe, sample handling, or fluid movement related.
Check the Specimen and Rack Setup
Inspect the sample tube type, urine volume, cap status, barcode position, and rack placement.
Make sure the tube is seated properly, has enough volume for testing, and is not foamy, excessively viscous, full of sediment, or improperly mixed.
Expected outcome: The analyzer has a valid specimen presentation for aspiration.
If correcting the specimen or rack setup resolves the issue, document the finding and stop.
Inspect for Obvious External Obstruction
Without performing deep disassembly, visually check the accessible sample probe area for dried urine, crystals, debris, bent alignment, or visible blockage.
Do not force the probe or insert objects into the probe unless allowed by site procedure and manufacturer guidance.
Expected outcome: Any visible external cause is identified without damaging the probe.
Check for Recent Problem Specimens
Ask whether the issue began after a heavily sedimented, contaminated, or low-volume urine specimen.
Urine sediment, crystals, mucus, or dried material can contribute to aspiration restriction or probe clog symptoms.
Expected outcome: The issue is linked to a likely sample-related obstruction if applicable.
Verify Reagent, Wash, and Waste Conditions
Check that required fluids are present, properly seated, not empty, not expired, and connected as expected.
Check the waste container or drain path for full containers, kinks, clogs, or improper positioning.
Expected outcome: The analyzer has the required fluid support for normal aspiration, rinse, and waste movement.
Inspect Accessible Tubing and Fluid Areas
Look for kinked tubing, disconnected lines, pinched hoses, leaks, bubbles, dried residue, or unusual fluid pooling in user-accessible areas.
Expected outcome: External fluid path problems are either corrected or ruled out.
If a loose external connection, kink, or empty fluid container is corrected and the analyzer passes testing, document and stop.
Run the Appropriate Onboard Cleaning or Rinse Routine
If available to Clinical Engineering at your site, run the analyzer’s approved probe cleaning, rinse, or maintenance routine.
Do not bypass covers, defeat interlocks, or perform internal fluidics service from memory.
Expected outcome: Minor debris or dried urine is cleared through the approved cleaning process.
Repeat with a Known Acceptable Sample or Control Material
After cleaning, have laboratory staff run an appropriate control, blank, or approved test specimen according to lab policy.
Expected outcome: Aspiration completes normally without clog, low volume, or flow-related errors.
If the test passes and QC/result review is acceptable, return the analyzer to service per facility process.
Check for Recurring or Intermittent Failure
If the issue returns after cleaning, note whether it occurs on every sample, one rack position, one tube type, or only certain specimen conditions.
Expected outcome: The failure pattern helps determine whether this is a specimen handling issue, probe issue, fluidics issue, or deeper mechanical problem.
Do Not Continue Repeated Patient Testing on a Questionable Analyzer
If aspiration errors continue, stop troubleshooting at the operational level.
Repeated aspiration faults may affect sample volume, image quality, result reliability, or specimen handling.
Expected outcome: Patient result integrity is protected.
If the Problem Persists
If the DxU 850 Iris continues to show sample aspiration, probe clog, low flow, or specimen pickup faults after external checks, specimen/rack verification, fluid checks, and approved cleaning routines, common external causes have been ruled out.
The device should be:
- Removed from service
- Labeled Out of Service
- Sent for repair, vendor support, or bench evaluation
The issue may involve internal probe alignment, fluidics, pumps, valves, sensors, tubing, or internal cleaning functions that should not be handled through basic troubleshooting alone.
Knowing when to stop is proper troubleshooting.
Clinical Use Tip
Do not troubleshoot aspiration or probe clog problems while patient specimens are actively running. Have laboratory staff move testing to another validated analyzer or follow downtime procedures before Clinical Engineering begins work.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Laboratory reported the Beckman Coulter DxU 850 Iris was producing sample aspiration errors and possible probe clog messages during urine specimen processing."
Cause
What was observed during troubleshooting.
Example:
"Checked specimen rack setup, tube volume, fluid containers, waste path, and accessible probe area; visible dried urine/debris was found near the sample probe area."
Resolution
What action was taken.
Example:
"Removed the analyzer from active testing, performed approved cleaning/rinse routine, verified fluids and waste setup, and had lab confirm successful test/QC run before returning the unit to service."
Helpful Details to Include (If Known)
- Whether patient specimens were affected
- Error or alarm message shown
- Rack position involved
- Tube type and urine volume
- Whether sample had heavy sediment, crystals, mucus, or foam
- Probe area condition
- Fluid container status
- Waste container or drain condition
- Any visible leaks, bubbles, or kinked tubing
- Cleaning or rinse routine performed
- QC or test result after troubleshooting
- Final device status
Final Thought
Sample aspiration and probe clog issues should be approached carefully because they can affect result reliability, not just analyzer uptime. Start with patient safety, specimen presentation, fluids, waste, and approved cleaning routines before assuming internal failure. Clear documentation protects the patient, the lab, and the Clinical Engineering repair history.
That is successful troubleshooting.