Colloidal gold early pregnancy test reagent and preparation method thereof

The invention discloses a colloidal gold early pregnancy test reagent. The colloidal gold early pregnancy test reagent mainly comprises a gold standard liquid linked to a primary antibody and a gold standard liquid linked to a secondary antibody. The invention also discloses a preparation method of the colloidal gold early pregnancy test reagent. The preparation method comprises preparation of nano-gold spheres, BSPP modification of the nano-gold spheres and antibody modification of the nano-gold spheres. A molecule with a thiol group is used to initially modify colloidal gold so that a superstability gold standard liquid is obtained. The colloidal gold is linked to the primary antibody and the secondary antibody so that the gold standard liquids I and II are obtained. The gold standard liquids has the advantages of high stability, rapid response, high sensitivity, low test paper consumable consumption, low cost, low temperature storage and good freeze-thaw effect. 本发明公开了种胶体金早孕检测试剂，所述胶体金早孕检测试剂主要由两部分组成，分别是链接抗和