Inflammation of the reproductive tract below is one of the common gynecological diseases in women, especially during pregnancy. If not are well-well-out-early and controlled in time can lead to dire consequences. Objectives: To describe clinical and subclinical characteristics of vaginitis in pregnant women at A Thai Nguyen Hospital from August 2020 to May 2021. Subjects and research methods: To give state about rate of microorganisms causing vaginitis and the agreement between diagnostic test results and clinical diagnosis of vaginitis in pregnant women at Thai Nguyen A Hospital. Results: The incidence of the lower genital tract was 41.0%, the causes include Candida albicans (36.5%), Gardnerella vaginalis (5%), and Trichomonas Vaginalis (0.5%). The agreement between clinical diagnosis and laboratory diagnosis is low and very low. A combination of clinical and laboratory tests is needed to diagnose the cause of vaginitis.