The TSH 3rd Generation (Thyroid Stimulating Hormone) test measures the level of TSH in your blood to assess how well the thyroid is functioning. TSH is produced by the pituitary gland and regulates the thyroid, which controls metabolism. This highly sensitive test can detect even small changes in thyroid function, helping diagnose conditions like hypothyroidism (underactive thyroid) or hyperthyroidism (overactive thyroid). It's useful for early detection and monitoring of thyroid disorders.