LDN was founded in 1996 and is a German-based company specialized in development, production and marketing of immunoassays (ELISA, RIA, Rapid tests) for in-vitro diagnostics, medical research, food safety. From the beginning the determination of Biogenic Amines with immunological test systems was in the core of our business – where we are nowadays the world wide market leader. Integral part of this success are e.g. our assays for the quantitative determination of Free Metanephrines in plasma, the Catecholamines, Histamine and Serotonin. This positive outcome encouraged us to expand our business to related diagnostic areas such as Food Safety (Histamine Food ELISA, Rapid Test) and Neurotransmitters/Amino Acids. Next, LDN introduced a comprehensive endocrinological panel, especially for niche parameters e.g. Free Testosterone, 17-OH-Progesterone Chromogranin A, DHT, Estrone. We continue to innovate on a consistent base, developing on average 5-7 new products a year.