An object of the present invention is to provide an immunoassay of PSA using an agglutination accelerator, which has an agglutination accelerating effect equal to or stronger than the known agglutination accelerator; hardly generates non-specific turbidity; and hardly generates salting out even in a solution with a high salt concentration. The present invention relates to an immunoassay of a prostate-specific antigen comprising performing an antigen-antibody reaction in the presence of a polymer having a monomer unit derived from a monomer represented by the following general formula [2]:
1
(wherein R
1
-R
3
are each independently a hydrogen atom or an alkyl group optionally having a hydroxyl group; R
4
is an alkylene group; R
5
is an alkylene group optionally having a substituent and optionally having an oxygen atom in a chain; R
6
is a hydrogen atom or a methyl group, and X is an oxygen atom or a —NH— group), and a kit of reagent for an immunoassay comprising a reagent containing an agglutination accelerator for the immunoassay.
本发明的目的是提供一种使用凝集加速剂的前列腺特异性抗原免疫测定方法,其凝集加速效果等于或强于已知的凝集加速剂;几乎不产生非特异性浑浊;即使在高浓度盐溶液中也几乎不产生盐析。本发明涉及一种前列腺特异性抗原的免疫测定方法,它包括在一种聚合物存在的情况下进行抗原-
抗体反应,该聚合物具有从由下列通式[2]表示的单体衍生而来的单体单元:
1
(其中 R
1
-R
3
各自独立地为氢原子或可选带有羟基的烷基;R
4
是亚烷基
5
是一个亚烷基,可选择带有一个取代基,并可选择在链中带有一个氧原子;R
6
是氢原子或甲基,X 是氧原子或-NH-基团),以及免疫测定试剂盒,该试剂盒包含用于免疫测定的凝集
促进剂。