A comprehensive guide to testing, medical imaging and other health and illness prevention-related services. Click on the screening category to learn more about these services, individual tests & screening items
The thyroid produces hormones, which regulate many of the body’s functions. Normal activity of the thyroid is essential in regulating these bodily functions or processes. Over or under production of hormones by the thyroid can cause irregularities in one’s metabolic rate, heart rate, digestive function, muscle control, brain development and bone maintenance.
A blood test for FT4 is used to evaluate thyroid function and diagnose thyroid disease. This can be the case for an underactive thyroid gland (hypothyroidism) or an overactive one (hyperthyroidism), where the thyroid is producing too little or too much of the hormone thyroxine.