Used in research settings to accurately measure ultra-sensitive levels of thyroid-stimulating hormone (TSH) in rat serum or plasma samples. This ELISA kit enables the detection of small fluctuations in TSH, making it valuable for studies related to thyroid function, endocrine disruption, hypothalamic-pituitary-thyroid axis regulation, and evaluation of thyroid-related diseases in rodent models. It is commonly applied in preclinical research, toxicology studies, and drug development involving thyroid hormone metabolism.