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This hormone is produced by the thyroid gland and regulates the metabolic processes of the body. High levels are seen in the disease hyperthyroidism. Symptoms include weight loss, tremor of hands, anxiety and increased sweating. Hypothyroidism (low levels) is due to reduced production by the gland and results in slowing down of metabolism with mental dullness, physical slowness and weight gain. The gland can be enlarged due to cysts or cancer and the level of free T4 may or may not be affected.
A glycoprotein hormone produced by the anterior pituitary and is the primary stimulus for thyroid hormone production by the thyroid gland. It is usually tested along with T3 and T4 to determine thyroid disorders.
Syphilis is a sexually transmitted disease (STD) caused by the spirochete, Treponema pallidum. TPHA is a diagnostic test for syphilis and is usually run if a VDRL test result is positive.
This type of fat is also found in fat tissue of the body and is a major source of energy for the body. Excess calories are converted to triglycerides and stored as fat tissue. Very high blood levels are associated with coronary risk.
