Aim: To compare the frequency of complications in patients with preinvasive lesions of the cervix after cervical conization and LLETZ treatment. Examinees and methods: In this cross-sectional research the analyzed data was that of patients treated by conization and LLETZ due to preinvasive cervical lesions. The patients were treated between January 1st, 2017 and December 31st, 2019 at the Clinic for Gynaecology and Obstetrics within the Clinical Hospital Centre Osijek. The data contains information about the age of patients, cone height (depth), localization of residual alterations of the cervix, presence of residual HPV infection and presence of postoperative stenosis and cervical insufficiency after conization and LLETZ treatment. Results: The arithmetic mean of age of patients treated by conization was 44,5 years (st. dev. 11,1 years), while the arithmetic mean of age of patients that received LLETZ treatment was 31,7 years (st. dev. 9,1 years). Patients treated by LLETZ had a significantly larger number of residual HPV infections when compared to patients treated by conization (P = 0,008). Median height (depth) of the cone in patients treated by conization (N = 198) was 15 mm with interquartile range from 11,25 to 20 mm. Patients treated by LLETZ (N = 22) had the arithmetic mean of the height (depth) of the cone 6,18 mm (st. dev. 3,92 mm). There was a statistically significant difference in the height (depth) of the cone after conization and LLETZ (P < 0,001). Conclusion: This cross-sectional study confirmed that patients treated by conization are significantly older than those treated by LLETZ. It also confirmed that the cones were deeper after conization, that the frequency of the residual changes at the edges of the cone is equal and that the occurrence of residual HPV infection is more frequent after treatment with LLETZ than after conization.