As a premium supplier, we attach great importance to product quality and comply with global quality standards. Therefore, our testing procedures are validated and as part of method validation a determination of the limit of detection (LOD) is described as a regulatory requirement in the United States Pharmacopeia (USP), the guidelines of the International Conference on Harmonization (ICH), and the ISO 17025 standard. The limit of detection indicates the lowest analyte concentration at which a reliable distinction can be made between a signal from a sample containing analyte and the background noise of a sample without analyte (blank).