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“ Biotin interferences are noted in immunoassays of thyroid markers, drugs, hormones, cancer markers, the biomarker for cardiac function ( β-human chorionic gonadotropin ), etc.”
“The apparent hCG concentration was found to decrease almost linearly as biotin increased from 100 to 1000 ng/mL, … only 10% of the expected value reported by the assay as biotin reached 1000 ng/mL. Further increase of biotin resulted in a progressive, albeit … moderate, decline in measured hCG ….”