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TT3 by immunoassay and LC-MSMS at TSH’s above the 95th percentile (3.70 mIU/L). Immunoassay TT3 and TSH was measured on the Roche Cobas 6000. Low values of TT3 are considered <80 ng/dL. More patients were classified as having low TT3 when measured by LC-MSMS, indicating a superior correlation with TSH compared to immunoassay.
