The main functions and roles of the spleen are to store lymphocytes, synthesize biologically active substances, filter the blood, and generate an immune response. If you need to check the function of spleen, you can perform blood test, abdominal ultrasound, abdominal CT, abdominal MRI, and so on. 1. Storage of lymphocytes: the spleen is the place where mature lymphocytes settle, of which B cells account for about 60% of the total number of splenic lymphocytes and T cells account for about 40%. 2. Synthesize biologically active substances: the spleen can synthesize and secrete certain important active substances, such as complement components and cytokines. 3. Filtering blood: about 90% of the circulating blood in the body flows through the spleen, which can purify the blood. 4. Immune response: The spleen is the main site of primary immune response to blood-borne antibodies. If you want to check whether there is any abnormality in the function of spleen in your daily life, you can go to the hospital for blood routine, abdominal ultrasound, abdominal CT, abdominal MRI and other tests to make it clear.