Lower abdominal rebound pain is most often seen in cases of intra-abdominal organ disease involving the adjacent peritoneum, as well as in primary peritonitis. So, what tests should be done for patients with lower abdominal rebound pain symptoms? The following is a brief introduction: 1. Blood count The white blood cell count increases in patients with acute appendicitis. As inflammation worsens, the white blood cell count increases and may even exceed 20×109/L. However, the white blood cell count does not necessarily increase in patients who are old and weak or whose immune function is suppressed. In conjunction with an increase in leukocyte count, there is also an increase in neutrophil count. The two are often seen together, but there are cases where only the neutrophils are significantly increased, which is equally important. Occasionally, if there is inflammation of the distal appendix and adhesions to the ureter or bladder, small amounts of red and white blood cells may be present in the urine. 3.Ultrasound It can show post-appendicitis because the spastic appendix acts as a transillumination window and makes the appendix visible. It is used to rule out chronic cholecystitis, chronic mesenteric lymphadenitis, chronic adnexitis in women and chronic urinary tract infections, which are most easily confused with chronic appendicitis. 4. Laparoscopy This test is one of the most definitive diagnostic tools for acute appendicitis. Because the laparoscopy can be inserted through the lower abdomen to directly observe the inflammation of the appendix, it can also distinguish other adjacent diseases with similar symptoms to appendicitis and can be treated at the same time. 5.X-ray barium enema Barium enema examination not only can clarify whether the pressure point is located at the appendix, but also is to exclude other diseases that can be confused with chronic appendicitis, such as ulcer disease, chronic colitis, cecum tuberculosis or cancer, etc.