What does the Thyroid Stimulating Hormone - TSH blood test mean? Get a free analysis of your blood test now. Here's what you get with our free analysis:
The TSH test measures the level of thyroid-stimulating hormone in the blood. TSH is produced by the pituitary gland and stimulates the thyroid gland to produce and release thyroid hormones. This test is crucial for diagnosing and monitoring thyroid disorders. It's often the first test done when thyroid dysfunction is suspected, as it's highly sensitive to changes in thyroid function. TSH levels are inversely related to thyroid hormone levels - high TSH usually indicates an underactive thyroid (hypothyroidism), while low TSH typically suggests an overactive thyroid (hyperthyroidism). The test is also used to monitor thyroid hormone replacement therapy in patients with thyroid disorders.
A TSH level below the reference range may indicate hyperthyroidism (overactive thyroid). This condition occurs when the thyroid gland produces too much thyroid hormone. Symptoms may include rapid heartbeat, weight loss, anxiety, tremors, and heat intolerance. Low TSH can also be caused by certain medications, pituitary gland disorders, or pregnancy. Further testing, such as free T4 and T3 levels, is usually required to confirm the diagnosis and determine the underlying cause.
A TSH level above the reference range often indicates hypothyroidism (underactive thyroid). In this condition, the thyroid gland doesn’t produce enough thyroid hormone, leading to symptoms like fatigue, weight gain, cold intolerance, and depression. High TSH can also be seen in subclinical hypothyroidism, where TSH is elevated but thyroid hormone levels are still normal. Other causes may include thyroid hormone resistance or certain medications. Additional tests, including free T4 levels, are typically needed to confirm the diagnosis and determine the appropriate treatment.