Screening check
Should I get my thyroid checked?
About 5% of US women and 3% of men have a mildly underactive thyroid that shows up only on a blood test. The US Preventive Services Task Force looked at whether adults without symptoms should be screened. Check what it says for you.
About you
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What you will see
What the USPSTF says about thyroid screening for you.
Educational only, not medical advice. General safety advice (not part of the USPSTF recommendation): do not change thyroid medicine without your clinician.
Source
US Preventive Services Task Force, March 2015 recommendation on screening for thyroid dysfunction; a 2024 literature scan found no new evidence to update it.
Validated in
Nonpregnant adults without symptoms of thyroid disease.
Limits
It does not cover pregnancy, symptoms or known thyroid disease, and it cannot interpret your own TSH result.
What the USPSTF recommends
| Who | Recommendation | Grade |
|---|---|---|
| Nonpregnant adults without symptoms | Evidence is insufficient to weigh the benefits and harms of screening for thyroid dysfunction | I |
The main screening test is a TSH (thyroid-stimulating hormone) blood test. Abnormal results should be confirmed with repeat tests over 3 to 6 months, and a T4 test then tells a mild (subclinical) problem from an overt one (USPSTF 2015). Literature scans in 2024 found no new evidence that would justify an update (USPSTF 2015).
What the TSH numbers mean
| Term | TSH | T4 |
|---|---|---|
| Subclinical hypothyroidism (mildly underactive) | Above the lab range, commonly 4.5 mIU/L | Normal |
| Overt hypothyroidism | High | Low |
| Subclinical hyperthyroidism (mildly overactive) | Below the lab range, usually 0.4 mIU/L | Normal (and normal T3) |
| Overt hyperthyroidism | Low or undetectable | High (or high T3) |
"Overt" is a lab definition and does not require symptoms (USPSTF 2015). By expert opinion, a TSH above 10.0 mIU/L is generally the point to start treatment for an underactive thyroid; between 4.5 and 10.0 is debated (USPSTF 2015).
Why the evidence falls short
About 5% of women and 3% of men in the US have subclinical hypothyroidism, and about 37% return to normal on their own after several years; only 2% to 5% go on to overt disease. Subclinical hyperthyroidism affects about 0.7% of people, and a quarter return to normal without treatment (USPSTF 2015). The USPSTF found no trials showing that treating thyroid problems found by screening improves outcomes such as heart disease, fractures or death (USPSTF 2015).
The main harms are false-positive results, labeling, overdiagnosis and overtreatment. TSH levels vary a lot and can shift with illness or some medicines, and there is no agreed normal range (USPSTF 2015).
Common questions
Who is more likely to have a high TSH?
Women, older adults, white people, and people with type 1 diabetes, Down syndrome, a family history of thyroid disease, a goiter, past hyperthyroidism or radiation to the head and neck. A low TSH is more likely in women, older adults, Black people, people with low iodine intake, a personal or family history of thyroid disease, or who take iodine-containing drugs such as amiodarone (USPSTF 2015).
What do other groups recommend?
As summarized by the USPSTF: the American Thyroid Association and the American Association of Clinical Endocrinologists recommend considering screening for hypothyroidism in people older than 60, and active case finding in people at increased risk and in women planning a pregnancy. Three British associations recommended against routine screening of healthy adults. The American Academy of Family Physicians endorsed the USPSTF recommendation (USPSTF 2015).
Is this about thyroid cancer?
No. This is about how well the thyroid works. For thyroid cancer, see the thyroid cancer screening check.
Also see the atrial fibrillation screening check, the osteoporosis screening check and all screening tests by age.
Sources
- LeFevre ML; US Preventive Services Task Force. Screening for Thyroid Dysfunction: U.S. Preventive Services Task Force Recommendation Statement. Ann Intern Med. 2015;162(9):641-650. www.uspreventiveservicestaskforce.org/uspstf/recommendation/thyroid-dysfunction-screening
Written and maintained by the uncovermyrisk.com editorial team. We do not have a medical reviewer; every claim links to its primary source above. Last reviewed: 2026-10-31. Spotted an error? See About.