Used in research settings to measure free thyroxine (FT4) levels in human serum or plasma samples. This ELISA kit enables the quantification of FT4, a key thyroid hormone, to support studies on thyroid function, metabolic disorders, and autoimmune thyroid diseases such as hyperthyroidism or hypothyroidism. It is widely applied in clinical research, endocrinology studies, and pharmaceutical development to assess thyroid status without the need for radioactive tracers. The assay is known for its sensitivity, precision, and high-throughput capability, making it suitable for large-scale population studies and diagnostic method validation.