Blood tests are usually the method used to detect subclinical hypothyroidism, as the condition is typically not noticed by clinical signs and symptoms. This is typically seen as subclinical hypothyroidism (high TSH, normal free T4). TSH is made by the pituitary and tells the thyroid to make thyroid hormones. The thyroid gradually becomes less efficient, and the body will attempt to make ever larger amounts of TSH to get the thyroid to do its job. Some patients with mild hypothyroidism might find that they feel tired, cold, constipated, and have dry skin, or none of the above.
Does Subclinical Hypothyroidism Always Need Treatment?
No. Not everyone who has subclinical hypothyroidism requires treatment. This depends on a number of factors, including the amount of TSH, age, symptoms, thyroid antibody levels, other health conditions, and whether thyroid function is progressing or not. A doctor may instead suggest waiting for the thyroid to change before starting thyroid hormone treatment if the level of TSH is only slightly elevated and the level of free T4 is normal.
When May Treatment Be Considered?
Treatment is more strongly recommended when the TSH is extremely raised, particularly if it is elevated for longer than usual. Treatment may also be considered for individuals who have clear features of hypothyroidism, high levels of thyroid antibodies, a familial history of thyroid disease, or certain cardiovascular risk factors. TSH targets are also more stringent during pregnancy or when planning pregnancy, so treatment thresholds may differ in these situations. A single thyroid test reading can't be taken as a decision-making tool; it should be used based on each patient's medical history.
When Is Monitoring Enough?
Individuals with a slight increase in TSH and a normal T4 level may be monitored. After an appropriate time, repeats of the routine monitoring tests are conducted to determine if TSH remains elevated, becomes normal, or becomes even higher. This is crucial as your thyroid function may vary from one day to the next. Some people with mild subclinical hypothyroidism do not develop a change in their condition, and in some, it progresses to full-blown hypothyroidism. Follow-up should be done at appropriate intervals to catch changes early, before they progress further.
Which Tests Are Used?
Two of the key tests for assessing subclinical hypothyroidism are TSH and free T4. Sometimes an antibody test of the thyroid may also be ordered. Positive thyroid antibodies may signal a thyroid autoimmune problem and can be used to determine the risk for future thyroid function alterations. Sometimes, more tests are necessary, depending on the patient's symptoms and medical history.
Can Subclinical Hypothyroidism Become Hypothyroidism?
The answer is yes, subclinical hypothyroidism may sometimes turn into overt hypothyroidism, which means that both TSH and free T4 are abnormal. However, it's not for everybody. Risk can differ with the severity of the elevation in TSH, presence of thyroid antibodies, age, and etiology of thyroid dysfunction. This is an important reason why follow-up testing for some individuals may be important even if treatment is not started immediately after.
What Symptoms Should You Watch For?
Some will have symptoms related to their underactive thyroid. This can consist of a persistent fatigue, cold intolerance, constipation, dry skin, change in energy levels or concentration. However, people don't only experience these symptoms in thyroid disorders. Blood tests may thus be useful to rule out thyroid problems in case of any suspicion. If symptoms do occur or persist, a health care provider can advise if further testing of the thyroid gland is needed.
Importance of Regular Thyroid Testing
But having an abnormal TSH doesn't necessarily mean that everything else is abnormal. Repeat testing will help determine if it is temporary or permanent. In Molecular Diagnostics and Therapy, thyroid blood tests can help in the assessment and monitoring of thyroid function. A nuclear medicine specialist, such as Dr. Nikunj Jain, will be able to help patients understand the implications of their results in the context of their symptoms, medical history, and relevant other factors.
Can Lifestyle Changes Treat Subclinical Hypothyroidism?
Good habits of living are imperative to health, but should not take the place of a medically sound evaluation and treatment. A well-balanced diet and proper nutrition, exercise, hygiene, sleep, and no unnecessary supplements can help the general feeling of well-being. But over-iodination or thyroid supplement use without a doctor's recommendation can be a problem and may cause thyroid problems. If thyroid hormone is prescribed, it should be taken as prescribed. Conclusion It is not always necessary to treat subclinical hypothyroidism. For others, however, particularly those with mild hypothyroidism (slightly high TSH, normal free T4), it may be more suitable to monitor closely using periodic thyroid tests. Others may find treatment useful depending on their TSH levels, symptoms, thyroid antibody levels, pregnancy, and other health factors. Regular follow-up is crucial as thyroid function can change over time. In addition to Dr Nikunj Jain, Molecular Diagnostics and Therapy helps patients interpret their thyroid test results and manage their thyroid function accordingly.