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What This Guide Helps With
Troubleshoot blood leak alarms or failed detector checks caused by contamination, tubing conditions, optical interference, preparation, or detector service issues.
Step-by-Step Troubleshooting
1. Protect the Patient and Treat the Alarm as Real
During active dialysis, follow clinical procedure for a blood leak alarm and do not assume the detector is malfunctioning. Do not bypass the blood leak detector.
If Clinical Engineering evaluation is needed, remove the machine from patient use and maintain treatment on another verified machine.
Expected outcome: Possible blood contamination of dialysate is treated as a patient-safety issue until clinically ruled out.
2. Confirm Whether the Problem Is Clinical or Equipment Related
Determine whether the issue was an actual blood leak alarm during treatment, a failed startup or detector test, or repeated alarms during non-patient preparation.
Document when the alarm occurs and whether it clears after the appropriate clinical response.
Expected outcome: The reported condition is clearly identified without dismissing a genuine blood leak event.
3. Inspect the Relevant External Fluid Path
With the machine out of clinical use and safely prepared for evaluation, inspect accessible dialysate tubing and connections for contamination, discoloration, air, improper routing, leakage, or residue that could interfere with optical detection.
Expected outcome: The external fluid path is clean, correctly connected, and free of obvious abnormalities.
4. Check for Residual Cleaning or Disinfection Effects
Determine whether the machine recently underwent cleaning or disinfection and whether all required rinse processes were completed.
Residue, trapped air, or incomplete preparation may affect detector operation.
Expected outcome: The machine has completed required preparation and rinse processes correctly. If this restores normal detector operation, troubleshooting may stop after successful verification.
5. Inspect the Accessible Detector Area
Inspect only externally accessible detector surfaces or windows permitted for routine Clinical Engineering inspection. Look for moisture, residue, contamination, or damage.
Clean only according to approved facility and manufacturer methods.
Expected outcome: The accessible optical path is clean and unobstructed. If cleaning corrects the detector test and all checks pass, troubleshooting may stop.
6. Check for Bubbles or Flow Irregularities
Observe the dialysate path during an appropriate non-patient test for persistent bubbles or unstable flow that could influence optical detection.
Correct visible external connection or supply problems before retesting.
Expected outcome: Dialysate flow is stable and free of abnormal visible air.
7. Repeat the Approved Detector Check
Perform the normal machine detector test or applicable manufacturer-approved verification without bypassing the detector.
Do not adjust detector calibration or sensitivity without approved service procedure and qualified authorization.
Expected outcome: The detector passes the required test and does not produce unexplained alarms. If successful after an external correction, troubleshooting may stop.
8. Escalate Repeated Detector Failure
If contamination, preparation, external tubing, bubbles, and visible flow conditions have been ruled out but the detector still fails, remove the machine from service.
Expected outcome: Suspected optical detector, sensing, calibration, hydraulic, or electronic problems are referred for service-level evaluation.
If the Problem Persists
Common external causes have been ruled out. Remaining causes may involve the blood leak detector assembly, optical sensing path, internal dialysate flow, calibration, electronics, or another service-level issue.
The device should be:
- Removed from service.
- Labeled Out of Service.
- Sent for repair or bench evaluation.
- Evaluated using appropriate B. Braun documentation and approved test equipment.
- Repaired or calibrated only by qualified personnel.
Complete required detector, alarm, dialysate, and functional tests before return to service.
Recognizing that a repeated blood leak detector failure cannot be safely bypassed is proper troubleshooting.
Clinical Use Tip
Never dismiss a blood leak alarm as a sensor problem while a patient is connected; treat the alarm according to clinical protocol first.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Dialysis staff reported repeated blood leak detector alarms during machine preparation with no patient connected."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found residue on the externally accessible detector area following cleaning."
Resolution
What action was taken.
Example:
"The detector area was cleaned using the approved method, the detector test passed repeatedly, and the machine completed functional verification before return to service."
Helpful Details to Include (If Known)
- Alarm during treatment or preparation
- Exact displayed message
- Recent cleaning or disinfection
- Detector test result
- Visible bubbles or flow instability
- Accessible detector condition
- Dialysate tubing condition
- Results before and after cleaning
- Repeat test results
- Final device status
Final Thought
Treat every blood leak alarm seriously, verify external fluid and optical conditions before assuming detector failure, never bypass protective monitoring, escalate persistent failures, and document final verification clearly.
That is successful troubleshooting.