What diseases can be detected by the seven thyroid function tests?

Generally, the "seven thyroid function tests" refer to a panel of seven tests used to evaluate thyroid function. The seven thyroid function tests include TT3 (triiodothyronine), TT4 (thyroxine), TSH (sensitive thyroid-stimulating hormone), FT3 (free T3), FT4 (free T4), TPO-Ab (thyroid peroxidase antibodies), and TG-Ab (thyroglobulin antibodies). The seven thyroid function tests can help detect various thyroid disorders, including subclinical hyperthyroidism, simple goiter, subacute thyroiditis, acute thyroiditis, and Hashimoto's thyroiditis. If experiencing any discomfort, timely medical consultation is recommended. Detailed explanations are as follows:

1. Subclinical Hyperthyroidism

Subclinical hyperthyroidism may be associated with autoimmune thyroiditis, Graves' disease, excessive iodine intake, and other factors. The seven thyroid function tests typically show decreased TSH levels, while FT3 and FT4 levels remain within normal ranges.

2. Simple Goiter

Simple goiter is usually associated with iodine deficiency or impaired thyroid hormone synthesis. In most cases, the results of the seven thyroid function tests are normal, although some patients may show mildly elevated TSH levels as the body attempts to maintain normal thyroid hormone levels.

3. Subacute Thyroiditis

Subacute thyroiditis is often caused by viral infections, such as mumps virus or influenza virus. The seven thyroid function tests may show fluctuating levels of TSH, FT3, and FT4, while TGAb and TPOAb levels may be elevated.

4. Acute Thyroiditis

Acute thyroiditis is typically caused by bacterial infections. The seven thyroid function tests may show changes in TSH, FT3, and FT4 levels, but diagnosis mainly relies on clinical symptoms, physical signs, and imaging studies such as ultrasound.

5. Hashimoto's Thyroiditis

Hashimoto's thyroiditis is a common autoimmune thyroid disease in which the thyroid gland is attacked by the body's own antibodies, leading to reduced thyroid hormone synthesis and secretion. The seven thyroid function tests typically show significantly elevated TPOAb and TgAb levels, with decreased FT4 and TT4 levels and increased TSH levels.

The seven thyroid function tests play an important role in diagnosing thyroid diseases. Combined with clinical symptoms, physical signs, and other diagnostic methods, they can assist in the diagnosis of various thyroid-related disorders.