I følge en undersøkelse som er omtalt i Science Daily 15. mars i år skal det være greit å ha TSH helt ned på 0,04 (neida, det er ikke skrivefeil for 0,4).

"Dr Graham Leese, from Ninewells Hospital and Medical School, led a research team examining patients on thyroxine replacement therapy. They studied how variations in these patients' TSH levels affected their long-term health. The study followed 16,426 patients taking thyroxine (86% female, mean age 60 years) and examined how their risk of contracting a range of diseases varied with their TSH levels.

The study found that patients with very high (>4.0mU/l) or suppressed (≤0.03mU/l) TSH levels more frequently suffered from heart disease, abnormal heartbeat patterns and bone fractures compared to patients whose TSH levels are in the normal range (0.4-4.0 mU/l). Patients who had a slightly low TSH level (0.04-0.4mU/l) did not have an increased risk of contracting any of these conditions.

These results show for the first time that it may be safe for patients taking long-term thyroxine replacement therapy to have a low but not suppressed TSH level. These patients do not show an increased risk of suffering from heart disease, bone fractures or abnormal heartbeat patterns. This means that patients may be able to take slightly higher doses of thyroxine than are currently recommended without having an adverse effect on their health."

http://www.sciencedaily.com/releases...0315230910.htm