Leucorrhoea is a kind of secretion from the vagina of a woman, and it is also a health gauge that reflects the condition of the woman's body. For example, the standard of leucorrhoea cleanliness can accurately reflect whether there is inflammation in a woman's vagina. For example, Ⅰ ~ Ⅱ degree is normal, Ⅲ ~ Ⅳ degree is abnormal leukorrhea, indicating vaginal inflammation.

　　Routine leukorrhea examination is the most common type of gynaecological examination, which mainly involves smearing the leukorrhea and observing it under a microscope to determine the vaginal cleanliness according to the number of vaginal bacilli, white blood cells (WBCs), and miscellaneous bacteria.

　　The criteria for leucorrhoea cleanliness are as follows:

　　Degree Ⅰ: there are a large number of vaginal bacilli and epithelial cells, no stray bacteria, white blood cells, the field of vision is clean, it is a normal secretion.

　　Ⅱ degree: moderate amount of vaginal bacilli and epithelial cells, a small amount of leukocytes and stray bacteria, still normal vaginal secretions.

　　Degree III: few vaginal bacilli and squamous epithelium, more stray bacteria and leukocytes, suggesting a milder vaginal inflammation.

　　Degree IV: no vaginal bacilli, only a few epithelial cells, a large number of leukocytes and stray bacteria. Suggests a relatively severe vaginal inflammation, such as mycosis vaginalis , trichomonas vaginitis.

　　It can be seen that Ⅰ ~ Ⅱ degree is normal, Ⅲ ~ Ⅳ degree is abnormal leucorrhoea, indicating vaginal inflammation. Therefore, women should always observe the status of their leucorrhoea in their daily life. Normal leucorrhoea is milky white, transparent and sticky, and changes with the menstrual cycle. If the nature of the leucorrhoea changes, it should cause alarm.