The accounting of the First People's Hospital of Chongqing is basically divided into several types. Respiratory tract samples include lung mucus, sputum, nasopharyngeal swab, etc. , respiratory tract samples, blood samples or stool samples of patients with respiratory diseases. You can choose.

Knowledge expansion:

The substance of nucleic acid detection is the nucleic acid of virus. Nucleic acid detection is to determine whether the patient is infected by COVID-19 by detecting whether there is nucleic acid of foreign invasive virus in respiratory tract samples, blood or feces. Therefore, once the nucleic acid is "positive", it can prove that there is a virus in the patient.

After COVID-19 infects the human body, it will first reproduce in the respiratory system, so we can judge whether the human body is infected with the virus by detecting the virus nucleic acid in sputum and nasopharyngeal swab. ? Therefore, positive nucleic acid detection can be used as a new standard for the diagnosis of novel coronavirus infection. The sampling is not standardized, the collection place is inappropriate, and the collected samples are atypical, resulting in too few or no cells infected by the virus in the samples. That is, it may cause "false negative".