Tubal lavage is both a test and a treatment. That is why there are many patients who do not get pregnant easily, but are more likely to get pregnant after having a tubal lavage. This is mainly because of two reasons: first, the fluid enters the patient’s uterine cavity and fallopian tubes under pressure during tubal lavage. If the patient has slight, membranous adhesions in the endometrium or the mucosa of the fallopian tubes, such adhesions may be flushed away under the pressure of the fluid. Therefore, tubal lavage can play a role in unblocking the fallopian tubes and can increase the patency of the tubes, so it can improve the patient’s chances of conception. Secondly, the fluid used during tubal lavage contains dexamethasone, antibiotics or herbs that activate blood circulation and remove blood stasis, such as Dan Hong injection, which can play a role in treating inflammation. If the patient has mild inflammation of the endometrium or fallopian tubes, the use of these drugs can have a therapeutic effect on the inflammation, and the effect of the drugs going directly into the local treatment is also better, so it can improve the woman’s chances of conception.