Used in biomedical research to measure luteinizing hormone (LH) levels in rat serum or plasma samples. Enables endocrine studies related to reproductive health, puberty, fertility, and hormonal disorders in laboratory animals. Commonly applied in toxicology, pharmacology, and developmental biology experiments to assess pituitary function and hypothalamic-pituitary-gonadal axis activity. Provides a sensitive and specific quantitative analysis, supporting high-throughput screening in preclinical studies.