Main methods of Covid-19 test: saliva collection device, nasal swab and oral swab

According to Ye Bingji, Chairman of the Supervisory Committee of the Macau Society of Laboratory Medicine, both nasopharyngeal swabs and oropharyngeal swabs are uncomfortable, but nasal swabs will not feel vomiting, and the sample sensitivity is higher. It is more important that the inspectors and residents cooperate with each other. The sampling work will be completed more smoothly.

In the global prevention and control of the new coronavirus testing is one of the important measures. The quality of samples taken during the testing process directly affects the test results. According to Ye Bingji's interview, there are currently three main methods for Covid-19 test sampling, including deep throat saliva (saliva collection device), nasopharyngeal swab and oral swab. The sampling method depends on the regional epidemic prevention measures.

Throat saliva (saliva collection device) test. The subject coughs up saliva into the sampling bottle. It sounds simple, but it is not just "spitting". It must be spit out through the oropharynx to contain nasal fluid. In other words, if the tester can only provide Oral saliva may greatly compromise accuracy. Ye Bingji suggested that you should not eat a lot or rinse your mouth before the test, which will affect the test results.

Nasal swab, extend the cotton swab attached to the reagent into the nasal cavity, and scrape the mucosal epidermis several times with moderate force. With an oral swab, extend the cotton swab attached to the reagent from the mouth into the pharynx, and scrape the mucous membranes of the bilateral pharyngeal tonsils and laryngopharyngeal wall with moderate force. He believes that the two sampling methods need to stay for a period of time, and the sampling will cause discomfort. Among them, oral sampling will cause nausea and vomiting, while nasal sampling will not, and will not cause mistaking of the detection stick.