Abstract: An object of the present invention is to provide a reagent kit, a measurement kit, and a measurement method for measuring serum amyloid A, which enable simple and rapid measurement of serum amyloid A by promoting dissociation of the serum amyloid A from HDL and carrying out an antigen-antibody reaction. According to the present invention, provided is a reagent kit for measuring serum amyloid A, including first particles having a label and modified with a first binding substance having a property of specifically binding to serum amyloid A, at least one nonionic surfactant having an HLB value of 17 to 20, which is defined by (inorganicity value/organicity value)×10, and a molecular weight of 1000 or less, and a buffer capable of adjusting a pH of a reaction solution to be in a range of 5.5 to 7.0 or a range of 8.5 to 9.0.

Abstract: An object of the present invention is to provide a reagent kit, a measurement kit, and a measurement method for immunologically measuring SAA with high accuracy and high sensitivity without using an alcohol designated as a hazardous material on the fire protection law. According to the present invention, provided is a reagent kit for measuring serum amyloid A, including first particles having a label and modified with a first binding substance having a property of specifically binding to serum amyloid A, at least one nonionic surfactant having a molecular weight of 1000 or less, and a buffer adjusting a pH of a reaction solution to be in a range of 5.5 to 7.0 or a range of 8.5 to 9.0.

Abstract: An object of the present invention is to provide a kit, a method, and a reagent which prevent the problem of false positive due to nonspecific adsorption, suppress the increase in noise to be generated, and are capable of achieving high-precision measurement of progesterone in a wide concentration range from a low concentration to a high concentration, in the measurement of progesterone in a biological sample.