I. Understanding Genes Genes are DNA or RNA sequences that carry genetic information (i.e., genes are segments of DNA or RNA that have a genetic effect), also known as genetic factors, and are the basic units of inheritance that control traits. Genes express the genetic information they carry by directing the synthesis of proteins, thus controlling the trait performance of biological individuals. Second, the concept of genetic testing genetic testing is through the blood, other body fluids or cells on the DNA detection technology, is to take the test person shedding oral mucosa cells or other tissue cells, amplification of its genetic information, through specific equipment to the test person cells in the DNA molecular information for the test, to predict the risk of disease in the body, analyze the various genes contained in it, so that people can know their own This enables people to understand their own genetic information, so that they can avoid or delay the occurrence of diseases by improving their living environment and habits. Genetic testing can be used to diagnose diseases as well as to predict disease risk. Disease diagnosis is the use of genetic testing technology to detect mutated genes that cause hereditary diseases. The most widely used genetic tests are the detection of hereditary diseases in newborns, the diagnosis of hereditary diseases and the auxiliary diagnosis of certain common diseases. There are more than 1,000 hereditary diseases that can be diagnosed by genetic testing technology. For testing, the genes of the subject are first extracted from the blood or other cells. Then the gene is copied many times with primers and PCR technology that can identify genes that may have mutations, and the mutant gene probe method with special markers, enzyme cutting method, gene sequence detection method, etc. are used to determine whether there is a mutation in this part of the gene or whether there is a sensitive genotype. Third, gene physical examination 1, through the gene physical examination can understand their own whether there is a familial disease-causing genes. 2, the correct choice of drugs, to avoid drug waste and adverse drug reactions. 3, to provide the best basis for the management of health risks. At present, the main methods of genetic testing are: fluorescence quantitative PCR, gene chip, liquid biochip and microfluidic technology.