Endocrine Abstracts

Introduction: Falsely high FT4 and FT3 with concurrent falsely low TSH have been reported in patients taking biotin and in a few case reports of patients with IgG anti-streptavidin antibody. However, other isotypes and effects on other immunoassays have not been reported.Case: A 77 year female presented with worsening fatigue with a background of hyperthyroidism on carbimazole. Clinically she appeared hypothyroid. Her results on Roche Cobas platform were...