White belt examination includes vaginal pH, vaginal cleanliness, vaginal microorganism, amine test, clue cells, etc. The indicators are as follows: 1. Vaginal pH: normal vaginal pH is 4-4.5, which is weakly acidic and prevents pathogenic bacteria from multiplying in the vagina, when the vaginal pH is greater than 5-6, it may be trichomoniasis or bacterial vaginitis; 2. A large number of vaginal epithelial cells and a large number of vaginal bacilli. Ⅱ degree indicates that there are vaginal epithelial cells, a small number of leukocytes, some vaginal bacilli and a few miscellaneous bacteria or pus cells can be seen under the microscope. Grade III indicates a small number of vaginal bacilli and a large number of pus cells with miscellaneous bacteria. Grade Ⅳ indicates that no vaginal bacilli are seen microscopically, except for a few epithelial cells, mainly pus cells and miscellaneous bacteria. Vaginal cleanliness Ⅰ-Ⅱ degree is normal and Ⅲ-Ⅳ degree may indicate the presence of vaginitis. 3. Vaginal microorganisms: Normally, there are no microorganisms in the vagina and the result shows negative. If Candida or Trichomonas is detected, the result may show positive, suggesting vaginitis. 4. Amine test: Also known as amine odor test, it is often used to diagnose bacterial vaginal diseases. The normal leucorrhea has no fishy odor, but if you have bacterial gynecological inflammation, the leucorrhea can give off a fishy odor, which is due to the release of ammonia when the amine produced by anaerobic bacteria meets potassium hydroxide; 5, clue cells: clue cells are the most sensitive and specific sign of bacterial vaginitis. If the leucorrhoea is yellow or yellow-green with odor, it may be trichomonas vaginitis.