A TSH just outside the range is common, often temporary and seldom a reason to start medication that week.
Jul 15, 2026
6 min read
Dr. Ines Carvalho
Thyroid results cause more needless worry than almost any other panel. TSH is sensitive: it shifts with illness, stress, pregnancy, the time of day and the biotin in a hair supplement.
One reading is not a diagnosis
A TSH of 5.2 with a normal free T4 and no antibodies usually calls for a repeat in six to eight weeks, not a prescription. About half of those readings return to normal on their own.
When it does matter
A TSH that stays high with a low free T4, or raised TPO antibodies, is a different story: that pattern is worth acting on, and worth an endocrinologist’s look.
Either way we run the whole panel, because TSH on its own can’t tell those two stories apart.
Dr. Ines Carvalho
Cardiologist, Tinsdale
