Tosoh ST-AIA PACK HCG Assay Recalled Due to Strensiq Interference
Tosoh Bioscience Inc is recalling ST-AIA PACK HCG assays because Asfotase Alfa (Strensiq) interferes with the test, potentially causing inaccurate results.
The agency’s classification
FDA (Devices): Class II
Class II is a situation in which use of or exposure to a violative product may cause temporary or medically reversible adverse health consequences, or where the probability of serious adverse health consequences is remote.
This is the agency’s own classification, taken from its notice. The severity score below is our assessment, not the agency’s. How recall classes work
What this means for you
Our assessment, not the agency’s: severity 2/5 (Moderate).
Minor labeling or packaging issue, or a voluntary precautionary recall. Risk of harm is low but real — follow the manufacturer's instructions.
Our severity reasoning: The recall is classified as FDA Class II, which typically indicates a situation where use of the product may cause temporary or medically reversible health consequences. The hazard is a diagnostic error due to drug interference, not a direct physical injury or life-threatening condition.
Plain-English summary
Tosoh Bioscience Inc is recalling the ST-AIA PACK HCG (Part Number: 025261) Assay, Reproductive Hormone. The recall involves 12,614 units distributed worldwide, including the United States, Canada, Mexico, and various countries in South and Central America.
The recall is issued because Asfotase Alfa (Strensiq) interferes with certain Tosoh assays. This interference can potentially cause falsely increased or falsely decreased immunoassay test results, depending on the specific assay used.
Healthcare providers and laboratories should stop using the affected product. Consumers should consult their healthcare provider regarding any recent test results that may have been affected by this interference.
The recalled product
- Product
- ST-AIA PACK ¿HCG; Part Number: 025261 Assay, Reproductive Hormone
- Manufacturer
- Tosoh Bioscience Inc
- Affected units
- 12,614
Is your product affected?
Check your packaging against the codes below. If any of them match, the product is part of this recall.
Lot numbers (1)
- All Lot Codes
Distribution
Distributed nationwide across the United States.
Part of a larger recall action
This product is one of 35 recalled by Tosoh Bioscience Inc under a single FDA (Devices) recall action. The agency files each product separately, so the size of the action is not visible from this page alone.
See all 35 products in this recall →Related recalls
Same manufacturer · Tosoh Bioscience Inc
See all →- ModerateTosoh ST AIA-Pack Testosterone Diagnostic Test Kit Recall
FDA (Devices) · 2026-07-22
- ModerateTosoh Thyroglobulin Antibody Calibrator Recalled for Calibration Failures
FDA (Devices) · 2021-03-17
- ModerateTosoh Bioscience Recalls AIA-PACK HCG Calibrator Sets Due to Stability Issues
FDA (Devices) · 2020-09-23
- ModerateTosoh Bioscience Recalls AIA-PACK BHCG Calibration Sets Due to Stability Issues
FDA (Devices) · 2020-09-23
- HighTosoh AIA-900 Analyzer Recalled for Substrate Monitoring Defect
FDA (Devices) · 2020-07-01
Same hazard · diagnostic error
See all →- ModeratePhilips Ingenia MRI Systems Recalled for Incorrect DTI Data Exports
FDA (Devices) · 2026-10-07
- HighSiemens Immulite 2000 Syphilis Screen Recall for Negative Bias
FDA (Devices) · 2026-08-26
- HighSiemens Immulite 2000 Syphilis Screen Recalled for Negative Bias
FDA (Devices) · 2026-08-26
- HighPhilips CT Scanners Recalled Due to Bolus Tracking Trigger Issue
FDA (Devices) · 2026-08-05
- HighPhilips IQon Spectral CT Recalled Due to Automatic Scan Trigger Failure
FDA (Devices) · 2026-08-05
Similar recalls
- ModerateTosoh Bioscience Recalls ST AIA-PACK Progesterone III Assay Kits
FDA (Devices) · 2018-03-07
- HighTosoh Bioscience Recalls Progesterone II Assay Kits Due to Cross-Reactivity
FDA (Devices) · 2018-03-07
- HighTosoh Bioscience Recalls HbA1c Control Due to Erroneous Results
FDA (Devices) · 2018-05-23
- ModerateTosoh ST AIA-Pack Testosterone Diagnostic Test Kit Recall
FDA (Devices) · 2026-07-22
- ModerateTosoh Bioscience Recalls ST AIA-PACK ACTH In Vitro Diagnostic Reagents
FDA (Devices) · 2019-01-02
- ModerateTosoh AIA-PACK B12 Recalled Due to Potential Fluorescein Interference
FDA (Devices) · 2019-01-02