BI-RADS assessment using for diagnosis of invasive ductal carcinoma:Introduction: Scientific evidence is needed to introduce non-invasive and effective diagnostic methods for early detection of breast cancer. One of these methods is the BI-RADS (Breast Imaging Reporting and Data System) assessment, which has entered the field of imaging. However, in the United States, 58% of all cases diagnosed negatively by ultrasound (BI-RADS1-3) were diagnosed by breast biopsy. The significance of BI-RADS assessment in Invasive Ductal Carcinoma will be investigated in the National Cancer Center of Mongolia Materials and methods: The study was conducted using the descriptive design from January 2021 to August 2021, based on the National Cancer Center of Mongolia. The study data were initially collected using a database of tissue and immunohistochemical analyzes and breast ultrasound. Of the 75 women aged 23-86, 81.3% were diagnosed with breast cancer. Results: The study found that 75.4% of women diagnosed with breast cancer by biopsy had a suspected BI-RADS cancer (4a-5). In addition, a woman's age is a statistically significant predictor variable in the diagnosis of peritoneal breast cancer (ROC = ROC = 0.736, p = 0.006). Conclusions: BI-RADS assessment can be used for invasive ductal carcinoma. Our study retrospectively included only women with cancer and other breast disease. In the future, it is necessary to study in detail the relationship between BI-RADS evaluation indicators and invasive ductal carcinoma.