The pH level of the regular white belt test is based on the acidity of the vagina, which is acidic and ≤4.5. This acidic environment prevents other pathogens from growing and reproducing in the vagina. The acidic environment depends on estrogen and lactobacilli in the vagina, which normally break down the glycogen in the vagina into lactic acid, making the vagina an acidic environment. If the pH level of a white blood test rises, it will lead to the growth of trichomonas and bacteria in the vagina, so testing the pH level of a woman can tell whether her defenses are functioning properly.