Cervical canal cells are absent, that is, only the cells on the surface of the cervix but not the cells in the cervical canal are obtained when the specimen is taken. Most of the cervical cancer lesions are found in the cervical canal at the squamocolumnar junction, so it is better to have another TCT test after two months or three months to avoid the possibility of clinical leakage. It is recommended to do the HPV test together with the TCT test. If there is no lesion in the TCT test, it does not mean that there is no HPV infection, so it is recommended to do the HPV test at the same time. If there is a high-risk HPV infection, the next step is to do colposcopy to detect abnormal cervical lesions, and if there are any, to treat them promptly.