TSH blood test is used to determine the thyroid levels in the blood . It can also detect the functioning of the thyroid gland and help to know its condition. The TSH test is prescribed when a person suffers from a thyroid gland. The doctors can also predict the disease by symptoms like fatigue, weight gain/loss, and mood swings. Routine screening for individuals at risk of thyroid disorders and pregnant women may have higher chances of thyroid levels and it's important to maintain the healthy ... TSH levels affect your metabolism, weight, and body temperature. Low TSH may suggest hyperthyroidism, while high levels point to hypothyroidism. A thyroid-stimulating hormone (TSH) test measures TSH levels in the blood , which can help doctors diagnose thyroid conditions. TSH stands for thyroid-stimulating hormone . A TSH blood test checks your TSH level. If it’s too high or too low, it may be a sign of a thyroid problem.