Objective — to determine the diagnostic value of conventional diagnostic methods for endometrial proliferative diseases. Material and methods. 204 medical records of patients with an endometrial hyperplastic process established by ultrasound study (USS) were retrospectively analyzed. The informative value of conventional diagnostic methods for endometrial hyperplastic processes, such as small pelvic USS and hysteroscopy, was ascertained on the basis of the final postmortem diagnosis. Results. The sensitivity and specificity of small pelvic USS in detecting endometrial hyperplastic processes were 75.5 and 23.9%, respectively; and those in identifying endometrial cancer were 46.8 and 94.9%. USS yielded false-positive and false-negative results in endometrial hyperplastic processes in 76 and 25% of cases, respectively, and in endometrial cancer in 26.6 and 53%. The overall accuracy of USS in endometrial hyperplastic processes and endometrial cancer was 36 and 83.8%, respectively. The sensitivity of hysteroscopy in diagnosing endometrial cancer was 53.8%, its specificity was 100%; the false-negative results were seen in 46% of cases, false-positive results were absent; the overall accuracy was 92%. In endometrial hyperplastic processes, the sensitivity and specificity of hysteroscopy were 46 and 94.9%, respectively. There were false-negative and false-positive results in 53.9%; the overall accuracy was 90.67%. The sensitivity of a hysteroscopic diagnostic technique for endometrial polyps was 87.4%; its specificity and overall accuracy were 59.7 and 75%, respectively; false-negative and false-positive results were ascertained in 12.6 and 26.2% of cases, respectively. Conclusion. The diagnostic value of hysteroscopy in identifying all the considered types of endometrial abnormalities is much higher than that of USS. Hysteroscopy is of the greatest value in detecting endometrial cancer as compared to that in endometrial polyps and it is less informative in diagnosing endometrial hyperplasia. The authors declare no conflicts of interest.