Diagnosis In general, your doctor may test for an underactive thyroid if you are feeling increasingly tired, have dry skin, constipation and weight gain, or have had previous thyroid problems or a goiter. Blood tests Diagnosis of hypothyroidism is based on your symptoms and the results of blood tests that measure the level of TSH and sometimes the level of the thyroid hormone thyroxine.
More Information Hypothyroidism diet Hypothyroidism: Can calcium supplements interfere with treatment? Hypothyroidism: Should I take iodine supplements? Soy: Does it worsen hypothyroidism? Show more related information. Request an Appointment at Mayo Clinic. More Information Coconut oil: Can it cure hypothyroidism? Share on: Facebook Twitter. Show references AskMayoExpert. Rochester, Minn. Chaker L, et al. The Lancet. American Thyroid Association. Accessed Oct.
Jameson JL, et al. In: Harrison's Principles of Internal Medicine. New York, N. Ferri FF. In: Ferri's Clinical Advisor Subclinical hyperthyroidism can be caused by both internal endogenous and external exogenous factors. Subclinical hyperthyroidism can occur in pregnant women, particularly in the first trimester.
The normal reference range for TSH in adults is typically defined as 0. When subclinical hyperthyroidism is left untreated, it can have several negative effects on the body:. A review of scientific literature found that low TSH levels spontaneously returned to normal in 50 percent of people with subclinical hyperthyroidism. Your doctor will work to diagnose what may be causing your subclinical hyperthyroidism. Determining the cause can help determine the appropriate treatment.
Your doctor will likely prescribe radioactive iodine therapy or anti-thyroid medications, such as methimazole. Radioactive iodine therapy and anti-thyroid medications can also be used to treat subclinical hyperthyroidism due to multinodular goiter or thyroid adenoma. Subclinical hyperthyroidism due to thyroiditis typically resolves spontaneously without any additional treatment required. If thyroiditis is severe, your doctor may prescribe anti-inflammatory drugs.
If the cause is due to TSH-suppressive therapy or hormone therapy, your doctor may adjust the dosage of these drugs where appropriate. Instead, your doctor may choose to retest your TSH levels every few months until they return to normal or your doctor is satisfied that your condition is stable. Your treatment will depend on what type of condition is causing your subclinical hyperthyroidism. These tests may include:.
Learn more about laboratory tests, reference ranges, and understanding results. Thyroid changes can happen during pregnancy. These changes are usually not significant, but some women can develop thyroid disease during pregnancy. Hyperthyroidism occurs in about one in every pregnancies, while hypothyroidism occurs in approximately one in every pregnancies.
Hyperthyroidism, and less often, hypothyroidism, may remain after pregnancy. If you develop a thyroid condition during pregnancy, your health care provider will monitor your condition after your baby is born. If you have a history of thyroid disease, be sure to talk with your health care provider if you are pregnant or are thinking of becoming pregnant.
The information on this site should not be used as a substitute for professional medical care or advice. Contact a health care provider if you have questions about your health. TSH Thyroid-stimulating hormone Test. What is a TSH test? Other names: thyrotropin test. It produces hormones that help regulate many bodily functions, such as metabolism, heart rate, and body temperature. In this article, we describe the TSH test and results. We also discuss what high and low TSH levels indicate and available treatments.
The ranges tend to increase as a person gets older. Research has not shown a consistent difference in TSH levels between males and females. However, according to the American Thyroid Association , doctors generally consider levels to be within a normal range if they are between 0.
The table below provides estimates of TSH levels that are normal, low indicating hyperthyroidism and high indicating hypothyroidism :. However, there is some debate about these ranges — the author of a review has found that normal levels are more likely to fall between 0.
Females are more likely to experience thyroid dysfunction than males. This includes hyperthyroidism and hypothyroidism. The risk of thyroid problems increases during pregnancy and around menopause. A study reports higher TSH levels in females than in males, but a study reports that males have higher median TSH levels.
It appears that any such difference is small, varies with age, and is unlikely to be clinically relevant. In some people, thyroid conditions are linked with sexual dysfunction. This may affect more males than females. Blood TSH levels tend to increase as a person gets older. According to the authors of one study , the percentage of people with TSH levels between 0.
Pregnancy hormones naturally increase the levels of certain thyroid hormones in the blood. This is essential for the development of the fetal brain and nervous system. At the same time, the levels of TSH in the blood decrease. As a result, doctors use lower reference ranges for pregnant women. The lower TSH range is decreased by around 0.
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