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	10/27/2025
Type of Reportable Event	Malfunction
Event or Problem Description
There was an allegation of questionable glucose hk results for 2 patient samples on a cobas 4000 c311 stand alone system.The customer stated that they had been experiencing abnormal sample aspiration for the past 15 days, as well as fluctuating test results without any alarms.Sample 1 had an initial result of 134.1 mg/dl.The repeat result was 87.4 mg/dl.Sample 2 had an initial result of 130 mg/dl.The repeat result was 85 mg/dl.
Additional Manufacturer Narrative
The glucose reagent lot number is 860090.The expiration date was not provided.The field service engineer (fse) replaced the pipette and cleaned the washing rinse.The investigation is ongoing.
Additional Manufacturer Narrative
The service maintenance actions performed by the fse 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
• MDR Report Key: 23606852
• Report Number: 1823260-2025-04746
• Device Sequence Number: 15932098
• Product Code: JJE
• UDI-Device Identifier: 04015630925551
• UDI-Public: 04015630925551
• Combination Product (Y/N): N
• Initial Reporter Country: MX
• 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: Foreign,Health Professional,User Facility
• Initial Reporter Occupation: Other Health Care Professional
• Type of Report: Initial,Followup
• Report Date (Section B): 12/16/2025

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
• Was Device Available for Evaluation?: Yes
• Is the Reporter a Health Professional?: Yes
• Type of Report(Section G): Follow-Up
• Initial Date Received by Manufacturer: 10/28/2025
• Supplement Date Received by Manufacturer: 11/26/2025
• Initial Report FDA Received Date: 11/20/2025
• Supplement Report FDA Received Date: 12/16/2025
• 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
• Patient Age: 27 YR
• Patient Sex: Female