Thyroid hormones should not be routinely offered to adults with a mildly underactive thyroid gland (know as subclinical hypothyroidism) say a panel of international experts in The BMJ today. Their strong recommendation against hormone treatment is base on new evidence that it does not improve quality of life or symptoms including low mood and fatigue.

Decisions with their patients

Their advice is part of The BMJ‘s ‘Rapid Recommendations’ initiative to produce rapid and trustworthy guidance base on new evidence to help doctors make better decisions with their patients. Sub clinical hypothyroidism (SCH) occurs when the thyroid stimulating hormone (TSH) levels in the bloodstream are slightly raise; while the level of thyroid hormone remains normal.

It affects up to about 5% of the adult population, but 10-15% of the elderly. While some people have no symptoms at all; so others can show mild signs of fatigue, low mood and weight gain; which may or may not be relate to the condition. Subclinical hypothyroidism can only be detect by a blood test. In the UK, about 25% of adults have thyroid function tests every year and guidelines tend to recommend hormones; so for those with TSH levels above 10 mIU/L (a normal TSH level is 0.4 to 4.0 mIU/L).

Research shows that hormone treatment for SCH has double from 1996 to 2006. So an international panel of clinicians and patients with SCH use; hence a recent detail analysis of the latest evidence (a systematic review of 21 trials and about 2,200 participants comparing the effects of thyroid hormone treatment with no treatment or placebo in adults with SCH) to develop recommendations for clinical practice.

Lifelong check ups

Using the GRADE approach (a system use to assess the quality of evidence); so the panel makes a strong recommendation against thyroid hormones for almost all adults with SCH; hence because there were no benefits from treatment on fatigue, low mood, weight gain or any other outcomes that were test.

What’s more, they say taking a pill and attending lifelong check ups is burden some; also they cannot rule out the possibility of harms. And while they did not take costs and resources into account; so beyond direct costs to patients, they say thyroid hormones cannot be cost effective.

The recommendation does not apply to women who are trying to become pregnant or patients; so with particularly high TSH levels (above 20 mIU/L). It may also not apply to patients with severe symptoms or some age under 30. Future research could explore whether there is an unidentified group of patients who might benefit from treatment, say the authors. In the meantime, if implemented, this recommendation “may substantially alter prescribing trends” they conclude.