Time-dependent changes in FT4 and FT3 levels measured using mass spectrometry after an acute ingestion of excess levothyroxine in a case with hypothyroidism

摘要

Changes in FT4, FT3 and TSH levels after the acute ingestion of 5 mg levothyroxine. The levels of FT4 and FT3 measured using ECLIA and ultrafiltration LC-MS/MS, TSH, and the daily dose levothyroxine ingested are shown. LT4, levothyroxine; IA, Electrochemiluminescence immunoassay; MS, ultrafiltration liquid chromatography-tandem mass spectrometry. * > 100 pmol/L