Anti-endometrial antibody IgG is a kind of immunoglobulin. There are five main types of immunoglobulins in colostrum, namely IgG, IgA, IgM, IgE and IgD, of which IgG has the highest content, accounting for about more than 55% of the total immunoglobulins, and is also the immunoglobulin with the longest serum half-life of about 23 days, and is an important antibacterial, antitoxin and antiviral antibody for the organism . The endometrium is the place where the embryo is laid and grows and develops. Negative anti-endometrial antibodies are normal, but in pathological conditions, such as endometritis, endometriosis and adenomyosis, the endometrium can be transformed into an antigen or semi-antigen, stimulating the body to produce the corresponding IgG antibodies itself. The presence of anti-endometrial antibodies in a woman’s body can lead to infertility, pregnancy cessation or miscarriage.