That the sexually active, lower income teenage female has a significant risk of developing cervical carcinoma in situ was the conclusion we reached after reviewing the statistics of a cervical cancer screening project covering a 5-year period of time. A total of 7520 teenage females had been screened as of January 1, 1972. This represented about 33% of the total screening effort. Of these, a total of 51 patients were found, on cytologic smear, to have cells sufficiently abnormal to warrant tissue diagnosis. There were 12 confirmed cases of carcinoma in situ, and 32 cases showed varying degrees of cervical dysplasia. Thus, carcinoma in situ occurred at a rate of I per 655 teenagers screened. The authors feel that with this rate, it is certainly worth the time, effort and cost required to include any sexually active female in all cervical cancer screening projects, regardless of her age.