although the levels of thyroxine in plasma fail to about half normal values , serum triiodothyronine remains close to normal values while the appearance of the thyroid varies , very marked hyperactivity being noted 7 days after commencement of treatment , this is less marked at 14 days , but even after 9 months treatment there is clear cut evidence for hyperactivity with colloid changes which indicate this has persisted for some time .
C0032105
plasma
C0229671
serum