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Letters |
Univ. of Vienna Med. School, Clin. Inst. for Med. and Chem. Lab. Diagnostics, Allgemeines Krankenhaus, Währingergürtel 1820, A 1090 Vienna, Austria
a Author for correspondence.
To the Editor:
Recently, we identified serum samples from seven patients with
no clinical signs of thyroidal illness with borderline to normal
thyrotropin (TSH) (0.132.14 mU/L; TSH-Ultra, Auto-DELFIA; Wallac,
Turku, Finland) and normal free thyroxine (FT4) (1221
pmol/L; FT4-Amerlex MAB; Johnson and Johnson, Amersham, UK)
but implausibly high T4 [339387 nmol/L; ES700;
Boehringer Mannheim (BM), Mannheim, Germany]. The results were
confirmed by reanalyses with different lots
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