Современные возможности лабораторной диагностики нарушений функций желудочно-кишечного тракта

The human gastrointestinal tract is more complex in its structure and volume of its functions, an organ, or rather, a system of organs. In addition, the intestinal microbiota, which, in turn, is part of the brain-intestine-microbiota axis, is also included in the process of implementing the tasks of the gastrointestinal tract. In this regard, not only instrumental, such as radio-radiological, ultrasound, endoscopic (with subsequent study of biopsy material) and other research methods are relevant, but also laboratory ones aimed at obtaining information about the microbiome and signal molecules involved in regulatory processes gastrointestinal tract. This literature review is devoted to the analysis of modern research methods for neurotransmitters synthesized by the digestive tract and of diagnostic value.