What are the effects and manifestations of abnormal results in the three thyroid function tests?
Jul 04, 2022
Source: Cainiu Health
Dr. Pan Yongyuan
Introduction
Abnormal results in the three thyroid function tests can disrupt the body’s normal metabolism. If serum thyroid hormone levels (T3 and T4) are elevated, TSH levels decrease—this condition is commonly known as hyperthyroidism. Conversely, if thyroid hormone synthesis and secretion are reduced, resulting in low serum T3 and T4 levels and elevated TSH, the body’s basal metabolic rate declines, leading to symptoms of hypothyroidism.
Abnormal results in the three key thyroid function tests can disrupt the body’s normal metabolism. Both excessive and insufficient thyroid hormone levels impair normal physiological functions. Common thyroid function indicators typically include serum thyroid hormones (T3 and T4) and thyroid-stimulating hormone (TSH). Thyroid dysfunction encompasses either excess or deficiency of thyroid hormones, as detailed below:
1. If serum thyroid hormone levels (T3 and T4) are elevated, TSH levels decrease—a condition commonly known as hyperthyroidism. This places the body in a hypermetabolic state, leading to symptoms such as weight loss, emaciation, palpitations, fatigue, heat intolerance, increased appetite, and frequent bowel movements.
2. If thyroid hormone synthesis and secretion are reduced, resulting in low serum T3 and T4 levels and elevated TSH, basal metabolic rate declines, causing hypothyroidism. Symptoms may include impaired memory, excessive sleepiness, reduced food intake, constipation, cold intolerance, and fatigue. In severe cases, patients may develop pericardial effusion or heart failure.
If any of the above symptoms occur, prompt consultation with an endocrinologist at a reputable hospital is essential. Treatment must be standardized according to the specific diagnosis: for hyperthyroidism, oral medications such as methimazole or radioactive iodine-131 therapy may be prescribed based on disease severity; in severe cases, surgical intervention may be required. For hypothyroidism, thyroid hormone replacement therapy is necessary. Regardless of whether the diagnosis is hyperthyroidism or hypothyroidism, strict adherence to the physician’s instructions regarding medication is mandatory—patients must not discontinue treatment or adjust dosages without medical guidance. Additionally, regular follow-up thyroid function testing is crucial for monitoring disease progression and treatment response.
