Do we Really Need to do both FT4 And TSH in Evaluating Patients?


Dear Sir,

Sincere admiration for your great website. Regarding evaluation of

thyroxine replacement therapy, it is always suggested to evaluate TSH

and free T4. However except in the situation of pregnancy (where only

depending on TSH could result in a retarded action), I don' t see much reason to

determine both values. Is it wrong to check only TSH ?

, Antwerp, Belgium