The nucleic acid test for novel coronavirus should not be done by blood sampling, but by throat swab. This is a respiratory transmission disease. After entering the human body, the virus mainly invades the body through the lung epithelial cells and multiplies in some locations, commonly in the lungs. However, since it is more difficult to take a specimen from the lungs, a pharyngeal swab specimen is usually used instead. A special swab should be applied to the pharyngeal swab, preserved in a special preservation solution and sent to the laboratory for testing as soon as possible. If viral nucleic acid structures are found, the nucleic acid specimen can be considered positive and can be used as a reference indicator to determine the diagnosis. If there is an epidemiologic history and clinical manifestations, coupled with a positive nucleic acid test on the throat swab, it is a confirmed case, and should be isolated and treated as a confirmed case. However, if the pharyngeal swab test is negative, with epidemiologic history and clinical symptoms, there is a possibility of further screening by repeated testing of the pharyngeal swab or going for deep secretions, doing sputum testing or doing alveolar lavage fluid testing. In the new 7th edition of the protocol, blood testing has been added, but instead of nucleic acid testing, blood testing is done for antibodies. Novel coronavirus pneumonia can be ruled out if it is a suspected case that has been ill for more than a week and is antibody negative, or if both nucleic acid tests are negative and the antibody is negative. Pharyngeal swab tests are usually respiratory secretions, and blood tests are usually done for antibodies, including IgM antibodies and IgG antibodies. Nucleic acid testing for novel coronavirus pneumonia is done on a throat swab or respiratory secretions or alveolar lavage fluid, and urine and fecal nucleic acid testing may also be done, but none of these are blood tests. Source: Dr. Yurai