MAUDE Adverse Event Report: ROCHE DIAGNOSTICS COBAS 4000 C311 STAND ALONE SYSTEM; CLINICAL CHEMISTRY ANALYZER

Catalog Number	04826876001
Medical Device Problem Code	Non Reproducible Results (4029)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	02/05/2026
Type of Reportable Event	Malfunction
Additional Manufacturer Narrative
The analyzer's serial number is (b)(6).The field service representative replaced the electrodes, performed wash racks, and performed checks and tests with acceptable results.The investigation is ongoing.
Event or Problem Description
There was an allegation of questionable sodium electrode results for 1 patient sample on a cobas 4000 c311 stand alone system.The initial result was 166 mmol/l, and the repeated result was 173 mmol/l.The repeated result was believed to be correct because it was obtained using new electrodes.
Additional Manufacturer Narrative
Sections d1-d4, g1, and g4 were updated.The calibration was acceptable.The qc shows frequent outliers and systematic shifts in the results.The investigation determined that the service actions resolved the issue.

• Brand Name: COBAS 4000 C311 STAND ALONE SYSTEM
• Common Device Name: CLINICAL CHEMISTRY ANALYZER
• Manufacturer (Section D): ROCHE DIAGNOSTICS; 9115 hague road; indianapolis IN 46250 0457
• Manufacturer (Section G): HITACHI HIGH TECH CORP.; 882 ichige hitachinaka; ibaraki 312-8 504; JA 312-8504
• Manufacturer Contact: natalie catton ; 9115 hague road; indianapolis, IN 46250-0457
• MDR Report Key: 24488231
• Report Number: 1823260-2026-00742
• Device Sequence Number: 20087764
• Product Code: JJE
• UDI-Device Identifier: 04015630925551
• UDI-Public: 04015630925551
• Combination Product (Y/N): N
• Initial Reporter State: KY
• Initial Reporter Country: US
• PMA/510(K) Number: K060373
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Serviced by Third Party (Y/N): Unknown
• Reporter Type: Manufacturer
• Report Source: Health Professional,User Facility
• Initial Reporter Occupation: Other Health Care Professional
• Type of Report: Initial,Followup
• Report Date (Section B): 04/02/2026

1 Device was Involved in the Event

1 Patient was Involved in the Event

• Is this an Adverse Event Report?: No
• Is this a Product Problem Report?: Yes
• Operator of Device: Health Professional
• Device Catalogue Number: 04826876001
• Device Lot Number: DUV03
• Was Device Available for Evaluation?: Yes
• Is the Reporter a Health Professional?: Yes
• Type of Report(Section G): Initial
• Initial Date Received by Manufacturer: 02/05/2026
• Supplement Date Received by Manufacturer: 03/10/2026
• Initial Report FDA Received Date: 03/02/2026
• Supplement Report FDA Received Date: 04/02/2026
• Was Device Evaluated by Manufacturer? (Y/N): Yes
• Is the Device Labeled for Single Use? (Y/N): No
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Patient Sequence Number: 1
• Concomitant Medical Products and Therapy/Usage Dates: MULTIVITAMIN.; SEROQUIL.; VITAMIN C.
• Patient Age: 77 YR
• Patient Sex: Female