Liquid-based cytology, in the clinic costs about 250-300 dollars. It is best to check within 3-7 days of menstrual cleansing, as the cervical canal has less secretion at this time, which will make the shedding of cells to a satisfactory level when the specimen is taken. No coitus, no vaginal insertion, and no vaginal douching are allowed before taking the specimen, so as not to affect the test result. And it is also recommended that the liquid-based cytology test be done at the same time as the HPV test, so that the two can be analyzed together. For example, HPV is the cause of cervical cancer, while the liquid-based cytology test is to check whether the cervical epithelium has lesions. So, there is both cause and effect. A comprehensive test and a comprehensive analysis is needed to understand what is really going on in the cervical epithelium.