The fT4 Rapid Quantitative Test is a fluorescence immunoassay designed for the quantitative determination of free thyroxine (fT4) levels in human serum. Thyroxine (T4) is the main thyroid hormone secreted into the bloodstream by the thyroid gland, essential for regulating the body's metabolic rate and influencing cardiovascular health, growth, bone metabolism, and neurological development.

Unlike total T4, the free form (fT4) represents the biologically active fraction, accounting for only 0.03% of total T4 in circulation. Measuring fT4 provides a more accurate evaluation of thyroid status since it is independent of variations in thyroid hormone-binding proteins. This test delivers fast, accurate, and reliable results, supporting clinical decisions related to thyroid dysfunction, including hyperthyroidism, hypothyroidism, and congenital hypothyroidism.

The fT4 Rapid Quantitative Test is an essential tool for hospitals, clinics, and diagnostic laboratories, offering efficiency and precision in thyroid screening and monitoring.