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Asset Type
Manufacturer
Model
What This Guide Helps With
Cartridge not detected, invalid strip errors, or failure to initiate testing due to insertion, contamination, or cartridge condition issues.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Do not troubleshoot while actively testing a patient sample. Use a backup analyzer if testing is needed immediately.
- Expected: No delay in patient care
- Why it matters: Cardiac marker testing is time-sensitive and delays can impact clinical decisions
Verify the Reported Issue
- Insert a test cartridge and observe the analyzer response.
- Check for:
- “Strip not recognized” or similar message
- No response after insertion
- Repeated prompts to reinsert cartridge
- Expected: Issue is reproducible
- Why it matters: Confirms a true device or cartridge issue vs user technique
Check Cartridge Type and Expiration (Most Common Cause)
- Verify the cartridge being used is valid for the cobas h 232.
- Action:
- Confirm correct test type for the analyzer
- Check expiration date on cartridge
- Ensure cartridge packaging is intact and unopened prior to use
- Expected: Valid cartridge is accepted
- Why it matters: Expired or incorrect cartridges are the most common cause of recognition failure
Inspect Cartridge Handling and Storage Conditions
- Improper storage can damage cartridges.
- Action:
- Confirm cartridges were stored per manufacturer requirements (temperature/humidity)
- Allow refrigerated cartridges to reach room temperature before use
- Avoid using cartridges exposed to moisture or condensation
- Expected: Properly stored cartridge functions normally
- Why it matters: Environmental exposure can affect cartridge integrity and readability
Check Cartridge Insertion Technique
- Improper insertion can prevent proper contact.
- Action:
- Insert cartridge fully until seated
- Ensure correct orientation
- Remove and reinsert firmly
- Expected: Analyzer recognizes cartridge immediately
- Why it matters: Misalignment prevents proper electrical or optical detection
Inspect Cartridge Slot for Contamination or Damage
- Debris or residue can interfere with cartridge detection.
- Action:
- Visually inspect slot for dirt, dried fluids, or debris
- Clean external accessible areas per manufacturer-approved methods
- Do not insert tools into the slot
- Expected: Clean interface allows proper recognition
- Why it matters: Contamination can block contacts or sensors
Power Cycle the Analyzer
- Reset the system to clear temporary faults.
- Action:
- Power off the analyzer
- Wait 10–15 seconds
- Power back on and retry with a known-good cartridge
- Expected: Normal cartridge detection restored
- Why it matters: Temporary software or communication issues may be cleared
Test with a Known-Good Cartridge Lot
- Rule out batch-related cartridge issues.
- Action:
- Use a cartridge from a different lot number if available
- Expected: Analyzer accepts cartridge
- Why it matters: Manufacturing defects or lot issues can cause repeated failures
If the Problem Persists
If all external causes have been ruled out, the issue is likely internal (cartridge reader, sensor, or interface fault).
Remove the device from service
Label as Out of Service
Send for repair or bench evaluation
Knowing when to stop prevents unnecessary risk and ensures proper resolution.
Clinical Use Tip
Always perform troubleshooting off-patient. If a cartridge is not recognized, immediately transition testing to another analyzer to avoid delays in critical cardiac results.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Analyzer not recognizing test cartridges during patient testing."
Cause
What was observed during troubleshooting.
Example:
"Contamination found in cartridge slot preventing proper detection."
Resolution
What action was taken.
Example:
"Cleaned cartridge interface and verified proper operation with known-good cartridge."
Helpful Details to Include (If Known)
- Cartridge type and expiration date verified
- Multiple cartridges tested (same/different lot)
- Slot condition (clean/contaminated)
- Indicator messages displayed
- Storage conditions confirmed
- Final device status (returned to service or sent for repair)
Final Thought
Effective troubleshooting starts with simple, external checks like cartridge condition and insertion. Always prioritize patient safety, and escalate appropriately when internal faults are suspected. Clear documentation ensures continuity and accountability.
That is successful troubleshooting.