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What This Guide Helps With
Troubleshooting DxU 840 Iris sample aspiration faults, probe clogs, low sample flow, or specimen pickup issues before repair escalation.
Step-by-Step Troubleshooting
Ensure Patient Safety First
Confirm the DxU 840 Iris is not actively processing patient specimens before opening covers, inspecting the sample area, or clearing any accessible obstruction.
If urine microscopy testing must continue, have laboratory staff use another validated analyzer or follow the approved downtime process.
Expected outcome: No patient specimen is delayed, lost, or resulted from a device with an unresolved aspiration issue.
Stop Additional Sample Loading
Ask laboratory staff not to load additional racks or specimens until the aspiration issue is understood.
Confirm whether any specimens were in process when the fault occurred and whether results were completed, flagged, aborted, or require repeat testing per lab policy.
Expected outcome: Incomplete or questionable urine microscopy results are not released.
Confirm the Reported Symptom
Ask staff what they observed. Check whether the issue involves:
- Sample aspiration error
- Probe clog message
- Low or no sample pickup
- Repeated failed aspiration on one specimen
- Failed aspiration across multiple specimens
- Bubbles or gaps in visible fluid movement
- Sample probe contacting the tube incorrectly
- Carryover, debris, or flow-related flags
Expected outcome: The problem is narrowed to sample condition, rack/tube positioning, probe access, fluid path, or analyzer fault.
Check the Sample Tube and Specimen Condition
Inspect the affected urine specimen container or tube for low volume, heavy sediment, clots, crystals, foam, debris, improper fill level, or an incorrect tube type.
Urine with heavy particulate matter can contribute to aspiration problems or probe restriction.
Expected outcome: If the problem follows one poor-quality specimen, have lab staff recollect, mix, centrifuge, or repeat according to lab policy. If resolved, stop troubleshooting.
Verify Rack and Tube Positioning
Confirm the specimen tube is seated correctly in the rack and is not tilted, overfilled, underfilled, capped, or positioned in a way that prevents proper probe access.
Check for damaged racks, incorrect rack type, barcode interference, or anything that prevents the tube from reaching the correct sampling position.
Expected outcome: The probe can access the specimen correctly. If reseating or replacing the rack resolves the issue, return the analyzer to service after successful verification.
Inspect the Probe Area Externally
With the analyzer stopped and safe to access, visually inspect the sample probe area for visible dried urine, crystals, debris, bent appearance, obstruction, or residue around the probe path.
Do not force the probe, bend it, or remove internal components beyond normal user-accessible cleaning.
Expected outcome: No obvious external contamination or obstruction is present. If visible residue is safely cleanable using approved facility/manufacturer cleaning practice, clean and retest.
Check for Probe Contact or Alignment Symptoms
Observe whether the probe appears to enter the tube opening cleanly during a safe test cycle or service-supported operational check.
If the probe strikes the tube edge, misses the tube, contacts the rack, or stops before reaching the sample, do not continue repeated testing.
Expected outcome: A properly aligned probe should access the sample without impact or abnormal movement. Misalignment should be escalated for bench or vendor evaluation.
Check Reagent, Wash, and Fluid Containers
Verify required system fluids, wash solutions, and waste containers are properly installed, not empty, not overfilled, and free of kinked external tubing.
Some aspiration complaints may be related to wash, rinse, waste, or fluid handling faults rather than the specimen probe alone.
Expected outcome: Fluid supply and waste conditions are normal. If correcting a bottle, cap, line, or waste condition clears the fault, perform verification testing before return to service.
Look for Kinked or Disconnected Accessible Tubing
Inspect only user-accessible tubing and fluid connections for kinks, pinches, leaks, loose fittings, air gaps, or obvious blockage.
Do not disassemble internal pumps, valves, syringes, sensors, or flow cell components during basic troubleshooting.
Expected outcome: Accessible fluid paths appear intact and properly connected.
Run the Approved Cleaning or Flush Routine if Available
If the analyzer provides an operator-accessible probe wash, rinse, unclog, or cleaning cycle, run it according to site procedure and manufacturer-approved materials.
Do not use improvised wires, sharp tools, compressed air, or non-approved chemicals to clear the probe.
Expected outcome: The cleaning routine completes without error and normal aspiration returns. If the issue clears, verify with QC or test material per lab policy and stop.
Restart Only When Safe and Appropriate
If the analyzer is idle and no patient specimens are at risk, perform a controlled restart if the issue may be software-state or motion-state related.
Confirm with lab staff before restarting because pending results, worklists, or queued specimens may be affected.
Expected outcome: The analyzer initializes normally and the aspiration error does not return.
Verify With Non-Patient Material or Approved QC
After any corrective action, have laboratory staff run appropriate QC, cleaning verification, or non-patient test material according to lab policy.
Confirm sample pickup, fluid movement, and result acceptability before releasing the device for patient testing.
Expected outcome: The DxU 840 Iris aspirates normally, produces acceptable results, and is safe to return to service.
If the Problem Persists
If the sample tube, specimen condition, rack positioning, accessible probe area, fluid containers, tubing, and cleaning routines have been checked and the aspiration or clog fault persists, the likely cause is internal.
Remove the DxU 840 Iris from service, label it Out of Service, and send it for repair, bench evaluation, or vendor service. Possible internal causes may involve the aspiration probe, pump, valve, tubing, pressure/flow sensing, sample transport alignment, or flow cell/fluidic pathway.
Knowing when to stop is proper troubleshooting. Repeated aspiration attempts can worsen clogs, damage the probe, compromise sample integrity, or risk inaccurate results.
Clinical Use Tip
Do not troubleshoot aspiration or probe clog issues while patient specimens are actively running. Have laboratory staff secure affected specimens, determine whether repeat testing is required, and move testing to another validated method before Clinical Engineering begins troubleshooting.
Maintain therapy and testing continuity by moving patient testing to another validated analyzer, approved downtime process, or laboratory-approved backup method before troubleshooting continues.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Laboratory staff reported the Beckman Coulter DxU 840 Iris displayed repeated sample aspiration/probe clog errors during urine specimen processing."
Cause
What was observed during troubleshooting.
Example:
"Found heavy sediment in the affected specimen and residue around the accessible sample probe area; rack and external fluid containers were seated correctly."
Resolution
What action was taken.
Example:
"Removed the affected specimen from testing workflow, cleaned the accessible probe area per approved procedure, ran the analyzer cleaning cycle, and lab verified operation with acceptable QC before return to service."
Helpful Details to Include (If Known)
- Error or message displayed on screen
- Whether the issue affected one specimen or multiple specimens
- Specimen condition, including sediment, foam, crystals, clots, or low volume
- Rack and tube position checked
- Probe area inspected for residue or visible obstruction
- External tubing checked for kinks, leaks, or air gaps
- Wash, reagent, and waste container status
- Cleaning or flush cycle performed
- QC or verification result after troubleshooting
- Whether patient results were held, repeated, or unaffected
- Final device status: returned to service or removed from service
Final Thought
Sample aspiration troubleshooting should move from patient safety to specimen quality, rack positioning, external fluid conditions, and approved cleaning steps before assuming internal failure. For the DxU 840 Iris, documentation should clearly show whether the issue followed one specimen or remained with the analyzer. When external causes are ruled out, removing the analyzer from service is the safest and most professional next step.
That is successful troubleshooting.