Table 2

 Further investigations

Free T4 (pmol/l) Equilibrium dialysisTBGAlpha subunit TSHAntibodies T4/T3FDH screen
TBG, thyroid binding globulin; T4, thyroxine; T3, triiodothyronine; TSH, thyroid stimulating hormone; FDH, familial dysalbuminaemic hyperthyroxinaemia.
Case 123.4 (normal)NormalNegativePositive
Case 219.6NormalNegativePositive
Case 318.6NegativePositive