Runs should be spaced over a clinically representative interval (i.e. 6 to 8 weeks for TSH in an outpatient setting). Use at least two different lots of reagents and two different instrument ...

Blocking reagents should reduce this rate more than ... by T 4 withdrawal or recombinant human thyroid-stimulating hormone (TSH) administration. Stimulated Tg of more than 2 ng/ml is suspicious ...