Luteinizing hormone (LH) is a glycoprotein produced by the pituitary gland and consists of two subunits with a total molecular mass of approximately 30 kDa. The α-subunit is identical to the α-subunit of other pituitary hormones, such follicle stimulating hormone (FSH), thyroid stimulating hormone (TSH), and chorionic gonadotropin (hCG). The β-subunit is unique to LH and confers the specific biological activity to the molecule. Luteinizing hormone stimulates ovulation and the development of the corpus luteum, and maintains the function of the corpus luteum during the first two weeks of pregnancy. In males, LH stimulates the production of testosterone by the testis. Cayman's human Luteinizing Hormone ELISA Kit is an immunometric (i.e., sandwich) ELISA which can be used to measure luteinizing hormone within the range of 0.5-200 mIU/ml. This assay offers specific and sensitive analysis of LH in human serum and has not been validated for other types of samples.