Human epidermal growth factor receptor 2 (ErbB-2, NEU, or HER2) standard, lyophilized, for use in running standard curves in AlphaLISA no-wash immunoassays. The standard consists of the extracellular domain of human HER2 fused to the Fc region of human IgG1. This standard is already provided in the AlphaLISA human ErbB2 kit, but can be ordered separately.