What's the difference between genetic testing and traditional physical examination?

Genetic testing often has a preventive function in the early stage, that is, knowing the risk or natural probability of illness in advance, and some people have genetic testing after illness in order to know whether they carry the disease-causing gene, and if so, help them take more targeted drugs (such as targeted drugs); Physical examination is to check the current physical function and confirm whether the body is healthy. The diseases that have been shown can basically be found, that is to say, genetic testing is more biased towards probability, and the physical examination is true or false.