MAUDE Adverse Event Report: TOSOH HI-TEC, INC. AIA-900; FLUOROMETER, FOR CLINICAL USE

Model Number	AIA-900
Medical Device Problem Code	Incorrect, Inadequate or Imprecise Result or Readings (1535)
Health Effect - Clinical Code	No Clinical Signs, Symptoms or Conditions (4582)
Date of Event	04/13/2026
Type of Reportable Event	Malfunction
Additional Manufacturer Narrative
A 13-month complaint history review and service history review for similar complaints was performed for "discrepant estradiol results" on the aia-900 analyzer through the aware date.There were three similar complaints identified during the search period, including this case.The analyte application manual for estradiol (e2) states the following: limitations of the procedure for diagnostic purposes, the results obtained from this assay should be used in conjunction with other data (e.G.Symptoms, results of other tests, clinical impressions, therapy, etc.).Using st aia-pack e2, the highest concentration of estradiol measurable without dilution is approximately 3000 pg/ml, and the lowest measurable concentration is 25 pg/ml (assay sensitivity).Although the approximate value of the highest calibrator is 3250 pg/ml, the exact concentration may be slightly different.The assay specification, assay range high, should be defined as the upper limit of the assay range, 3000 pg/ml.Although hemolysis has an insignificant effect on the assay, hemolyzed samples may indicate mistreatment of a specimen prior to assay and results should be interpreted with caution.Lipemia has an insignificant effect on the assay except in the case of gross lipemia where spatial interference may occur.Specimens from patients with hyperbilirubinemia may yield falsely elevated results.Certain medications may interfere with assay performance.Specimens from patients taking medicines and/or medical treatment may show erroneous results.All results should be interpreted with respect to the clinical picture of the patient.The most probable cause of the estradiol results could not be established.
Event or Problem Description
A customer reported two discrepant results for estradiol (e2) on the aia-900 analyzer.Sample #1 was reported out with a result of 600 pg/ml.Providers questioned the result, reran the sample and received a new result of 25 pg/ml, which was the expected value.Sample #2 was reported out as less than low (

• Brand Name: AIA-900
• Common Device Name: FLUOROMETER, FOR CLINICAL USE
• Manufacturer (Section D): TOSOH HI-TEC, INC.; 1-37, fukugawa minami-machi; shunan, yamaguchi 74600 42; JA 7460042
• Manufacturer (Section G): TOSOH HI-TEC, INC.; 1-37, fukugawa minami-machi; shunan, yamaguchi 74600 42; JA 7460042
• Manufacturer Contact: jorge porras ; 2-2-1 yaesu; chuo-ku, tokyo 10400-28 ; JA 1040028 ; 6506368314
• MDR Report Key: 25145143
• Report Number: 3004529019-2026-00064
• Device Sequence Number: 18444804
• Product Code: KHO
• UDI-Device Identifier: 04560189283992
• UDI-Public: 04560189283992
• Combination Product (Y/N): N
• Initial Reporter State: NY
• Initial Reporter Country: US
• PMA/510(K) Number: K971103
• Number of Events Summarized: 1
• Summary Report (Y/N): N
• Serviced by Third Party (Y/N): N
• Reporter Type: Manufacturer
• Report Source: Health Professional
• Initial Reporter Occupation: Other Health Care Professional
• Type of Report: Initial
• Report Date (Section B): 05/11/2026

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 Model Number: AIA-900
• Device Catalogue Number: 022930
• Was Device Available for Evaluation?: Yes
• Is the Reporter a Health Professional?: Yes
• Type of Report(Section G): Thirty-Day
• Initial Date Received by Manufacturer: 04/13/2026
• Initial Report FDA Received Date: 05/11/2026
• Was Device Evaluated by Manufacturer? (Y/N): No
• Date Device Manufactured: 02/01/2022
• 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
• Usage of Device: Reuse
• Patient Sequence Number: 1
• Patient Sex: Unknown