Colposcope (colposcope) is a gynecologic clinical diagnostic instrument and one of the gynecologic endoscopes. It is suitable for the diagnosis of various cervical diseases and genital lesions, and is also an important way for the early diagnosis of male and female diseases. Timing and conditions for colposcopy 1. More than 3 days after menstruation and more than 7 days before the next menstruation. 2.It is better not to have intercourse within a week. 3.Do not use medicine within days. 4.Vaginal cleanliness should be in accordance with degree I or II, which will be checked by the doctor before. If it doesn’t meet, you should use the medicine first. Doscopy is used to visualize cervical, vaginal, vulvar and genital lesions in the lower genital tract. Since colposcopy can magnify lesions 10-40 times, it lends itself to the observation of smaller lesions that cannot be seen with the naked eye, and biopsies can be performed under colposcopic positioning, thus increasing the positive detection rate and assisting in the early clinical detection of precancerous and cancerous lesions. If cytological methods are used in combination with colposcopy and microscopic biopsy, as well as cervical canal scraping if necessary, the diagnostic accuracy of precancerous lesions and early invasive carcinoma can be improved to 92%, and early treatment can significantly increase the survival rate of patients. Therefore, colposcopy is an important tool for early diagnosis and early treatment of lower genital tract cancer. In addition, electronic colposcopy can also be used clinically for ablation and excision of superfluous organisms. With the continuous development of photoelectric technology, photographic technology and computer applications, colposcopy has become not only valuable in the diagnosis of cervical, vaginal and vulvar lesions, but also has a greater role for following up the treatment effect and for further research on the etiology, pathogenesis and pathological process of tumor development. Colposcopy can also identify benign lesions to avoid unnecessary biopsies such as inflammation, polyps, and cervical hypertrophy and hyperplasia in pregnant women; colposcopy can assist in reducing the chance of missed diagnoses with false-negative shedding cells and can reduce partial conical hysterectomies. Colposcopy not only aids in the diagnosis of vaginal adenopathy, which has its own special differential value, but also identifies verrucous hyperplasia in venereal diseases of the lower genital tract. Vaginal exfoliative cytology is performed with a Pap grade III or higher. Although cytology is positive, carcinoma is suspected by visual observation. Those who have been treated for a long time for cervicitis but with poor results. Lesions that are difficult to determine the shape and structure of the lesion cells by visual observation and need to be observed under colposcopy at magnification. Before surgery for cervical cancer, colposcopic determination of the area affected by the lesion is needed to guide the extent of the surgery that should be removed. Severe acute and subacute infections in the lower genital tract should be identified and treated before investigation. Wounds or contusions in the genital tract should be investigated after epithelial repair. If there is active bleeding, check again after stopping the bleeding. Colposcopy can be repeated and is non-invasive and has no side effects, but it is important to stop vaginal douching and medication for 3 days before the examination, and to prohibit sexual intercourse, vaginal douching and vaginal plugs. It is advisable to provide the doctor with the results of cervical smear or TCT beforehand to help determine if a biopsy is needed. Colposcopy should usually be performed within two weeks after menstruation. There is no time limit for those with suspected cervical cancer or precancerous lesions. For lesions in the cervical canal, it is advisable to examine them close to the time of ovulation. Patients undergoing colposcopy do not require fasting, enemas, shaving, or hospitalization. The gauze is removed at night during the bath. If you feel blood flowing out of the vagina during this time or if there is heavy bleeding after the gauze is removed, you should go to the hospital emergency room immediately.