The iodine-negative zone indicated here generally refers to the test in gynecological examination, which indicates that the cervix is not diseased and is a normal phenomenon. Iodine negative zone is a result of iodine test, iodine test is to use iodine solution to smear the cervix, the normal cervix or vaginal squamous epithelium is rich in glycogen, can be stained brown under the action of iodine solution, iodine negative zone usually indicates that there is no pathology of the cervix, it is a normal phenomenon, do not need special treatment. A positive iodine test indicates that the cervix is not colored, which may be caused by cervical inflammation, scarring, cysts and other disease factors. If the iodine test is abnormal, it is recommended to go to the hospital; if the iodine test is normal, there is no need for special treatment, and if necessary, the doctor can combine the results of other tests and related clinical manifestations to make a judgment.