The phenomenon of lymphocyte regression of phytohemagglutinin is a symptom of protein losing gastroenteropathy syndrome, also known as protein losing gastroenteropathy, or protein leaking gastroenteropathy or exudative gastroenteropathy. It is a syndrome caused by the loss of plasma protein, especially albumin, from the gastrointestinal mucosa due to various reasons. The main clinical manifestations are generalized swelling and hypoplasmosis. Small intestinal lymphangiectasis is often associated with immunoglobulin loss and abnormal cellular immunity, and the lymphocyte repertoire of phytohemagglutinin is diminished, making it susceptible to pulmonary infections. Tests required for lymphocyte regression of phytohemagglutinin: 1. Gastric filling and emptying function test Gastric filling and gastric emptying function test can be detected by real-time ultrasound penalty. The real-time ultrasound method for gastric emptying is safe, reliable, easy to repeat, and economical. It can show changes in gastric filling and emptying. The real-time ultrasound method for detecting gastric emptying is safe, reliable, easily reproducible, and economical. Abnormal results: the half-life of gastric fluid emptying is shortened, and the volume of the stomach shrinks significantly in minutes after drinking water. 2.Gastric emptying measurement and imaging Gastric emptying measurement and imaging to find the cause of gastric dysfunction and to observe the efficacy of gastric motility drugs. Gastric emptying measurement and imaging measurement and imaging to find the cause of gastric dysfunction and to observe the efficacy of gastrodynamic drugs. It is important for the diagnosis of duodenal ulcer, atrophic gastritis, Zollinger-Ellison syndrome, Chagas disease, pancreatic insufficiency and hyperthyroidism. 3.Abdominal plain film A picture of the abdomen taken without introducing any contrast is called an abdominal plain film. The density of the organs in the abdominal cavity are all soft tissue densities and lack natural contrast. However, when a certain organ is calcified due to disease or there is a foreign body or stone impervious to X-ray, or when there is free gas in the abdominal cavity, or when there is an increase in gas or fluid in the intestinal cavity or when there is dilatation of the intestinal canal, there will be a difference in density and it will be shown on the photograph. In addition, under normal conditions, the fatty layer of the abdominal wall, the fatty layer around the kidneys and the shadow of the psoas major muscle can also be shown on the radiographs. The abdominal plain radiographs include upright anteroposterior, upright lateral, supine anteroposterior, lateral horizontal and supine horizontal lateral. Among them, the upright anteroposterior view can show the free gas under the diaphragm, the fluid level in the intestinal or abdominal cavity, and the gas-liquid level in the liver or abdominal abscess. The upright lateral position is suitable for the localization of intra-abdominal masses, abscesses, calcifications, and stones. In infants with intestinal obstruction, the small intestine and colon are not easily distinguished and this position can be applied to identify them. The supine anterior-posterior position can clearly show the distribution of dilated intestinal curves, the degree of dilatation and the distance between intestinal walls. The supine horizontal position is suitable for examining patients who are critically ill and cannot stand and need to know whether there is free gas in the abdominal cavity or fluid level in the intestinal cavity and whether there is fluid in the abdominal cavity. The supine horizontal lateral position is suitable for patients who are critically ill and should not be turned much, it can show a small amount of pneumoperitoneum and intestinal gas and fluid plane, and at the same time can determine the location of abscesses, etc. 4.Abdominal CT The purpose of abdominal CT examination is to understand whether there are infectious diseases in the abdominal organs, such as: inflammation, tuberculosis, abscess, etc.; whether there are occupancies, such as benign and malignant tumors, metastatic tumors, etc.; whether there are deformities, stones, obstruction, perforation, fluid accumulation, etc. 5.Fecal fat quantification The fecal fat quantification examination can understand the digestion and absorption function and assist in the diagnosis of digestive system diseases.