MAUDE Adverse Event Report: ROCHE DIAGNOSTICS ELECSYS FT4 IV; FREE THYROXINE

Model Number	FT4 IV
Medical Device Problem Codes	Low Test Results (2458); Non Reproducible Results (4029)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Type of Reportable Event	Malfunction
Event or Problem Description
1.Describe the event: there was an allegation about questionable results for 1 patient not matching the patient's clinical history when tested for elecsys ft4 iv on a cobas e 801 analytical unit and compared to a different cobas analyzer.2.Patient age range: asku.3.Patient weight range: asku.4.Patient sex breakdown: asku.5.Patient race breakdown: asku.6.Patient ethnicity breakdown: asku.
Additional Manufacturer Narrative
1.Summary of investigation results: the investigation is ongoing.2.Summary of follow up/corrective actions taken: the investigation is ongoing.3.Device returned to manufacturer? no.4.Device labeled "for single use?" no.5.Device reprocessed and reused? no.
Additional Manufacturer Narrative
1.Summary of investigation results: the investigation did not identify a product problem.The cause of the event could not be determined.2.Summary of follow-up/corrective actions taken: the field service engineer checked the instrument and the sample needle and restored the fluid connection.

• Brand Name: ELECSYS FT4 IV
• Common Device Name: FREE THYROXINE
• Manufacturer (Section D): ROCHE DIAGNOSTICS; 9115 hague road; indianapolis IN 46250 0457
• Manufacturer (Section G): ROCHE DIAGNOSTICS GMBH; sandhofer strasse 116; mannheim (baden-wurttemberg) 68305 ; GM 68305
• Manufacturer Contact: natalie catton ; 9115 hague road; indianapolis, IN 46250
• MDR Report Key: 23369426
• Report Number: 1823260-2025-04319
• Device Sequence Number: 9950739
• Product Code: CEC
• UDI-Device Identifier: 07613336172780
• UDI-Public: 07613336172780
• Combination Product (Y/N): N
• PMA/510(K) Number: K220456
• Exemption Number: VMSR
• Number of Events Summarized: 1
• Summary Report (Y/N): Y
• Serviced by Third Party (Y/N): Unknown
• Reporter Type: Manufacturer
• Initial Reporter Occupation: Other
• Type of Report: Initial,Followup
• Report Date (Section B): 01/16/2026

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?: No
• Device Expiration Date: 05/31/2026
• Device Model Number: FT4 IV
• Device Catalogue Number: 09043284190
• Device Lot Number: 868732
• Is the Reporter a Health Professional?: No
• Type of Report(Section G): Follow-Up
• Initial Date Received by Manufacturer: Not provided
• Supplement Date Received by Manufacturer: 10/31/2025
• Initial Report FDA Received Date: 10/23/2025
• Supplement Report FDA Received Date: 01/16/2026
• Is This a Single-Use Device that was Reprocessed and Reused on a Patient? (Y/N): No
• Patient Sequence Number: 1
• Patient Sex: Unknown