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 lymphadenopathy 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 for lymphocyte rejuvenation of phytohemagglutinin caused by functional dyspepsia: 1. Fat measurement in stool Fat quantification is a simple and reliable test to diagnose steatorrhea. The amount of fat excreted in the stool of a normal person in 24h is <6g, or the fat absorption coefficient is >94%; with the 14C-triglyceride absorption test, a normal person breathes out markers greater than 3.5% of the given amount per hour. Schilling test for vitamin B12 absorption Abnormalities often suggest terminal ileal lesions, and patients with pancreatic exocrine insufficiency also often have impaired vitamin B12 absorption. the Schilling test is also useful in diagnosing small intestinal bacterial overgrowth, especially in blind loop syndrome, scleroderma and multiple small intestinal diverticula. Parts 1 and 2 of the Schilling test are abnormal in the case of blind loop syndrome, for example. After appropriate antibiotic treatment, the Schilling test can return to normal. The significance of B ultrasound and endoscopy, other imaging examinations (including X-ray, CT, MRI, etc.) is to exclude organic diseases and to facilitate the differentiation from organic lesions such as gastric and duodenal ulcers, esophagitis, liver, biliary and pancreatic diseases and tumors. x-ray and MRI imaging techniques can also reflect the gastric emptying rate at different times to a certain extent. 4, gastric emptying measurement techniques Nuclear scan is considered the gold standard for measuring gastric emptying, 25% to 50% of patients with prolonged gastric half emptying time, mainly for solid food half emptying time.