how to collect nasopharyngeal swab?
After several times of nucleic acid sampling and testing, citizens wondered: why do some people require nasopharynx swabs and some people can collect oropharyngeal swabs? Today, experts from cell medical will explain to you.
What is a sampling swab?
At present, except for special diseases, COVID-19’s nasopharyngeal swabs and oropharyngeal swabs are the most common ways of collecting.
Studies have shown that nasopharyngeal swabs have higher detection rate of COVID-19 nucleic acids than oropharyngeal swabs. Because the nasopharyngeal cavity is relatively closed and the virus is easier to accumulate. However, whether it is oropharyngeal swab or nasopharyngeal swab, the key is that the collection action must be standardized, in place and meet the standards. As long as the acquisition is standardized, both methods can achieve the expected detection purpose.
How to collect a nasopharyngeal swab?
nasal swab collection method_How to collect a nasopharyngeal swab？
1. The patient’s head tilts back (about 70 degrees) and persists. 2. Use a swab to estimate the interval from the ear root to the nostril. 3. Insert from the nostril pen to the face. The deepening interval should be at least half of the length from the earlobe to the tip of the nose. Reach the posterior nasopharynx after encountering resistance, stay for several seconds to absorb secretions (generally 15 ~ 30s), and rotate the swab for 3 ~ 5 times. 4. The swab should be gently rotated and taken out, and the swab head should be immersed in a collection tube containing 2ml lysate or cell preservation solution containing RNase inhibitor. 5. Break the sterile swab rod at the top, discard the tail, tighten the tube cover and close it with sealing film.
oropharyngeal swab collection
collection method of oral swabs
1. Ask the patient to gargle with normal saline or clear water first.
2. Wet the flocked swab in sterile normal saline.
3. The patient sat down with his head tilted back and his mouth open, accompanied by an “ah” sound.
4. Fix the tongue with a tongue depressor, and the swab jumps over the root of the tongue to the posterior pharyngeal wall, tonsil recess, lateral wall, etc.
5. The bilateral pharyngeal tonsils should be swabbed back and forth with moderate force for at least 3 times, and then the posterior pharyngeal wall should be swabbed for at least 3 times, 3 ~ 5 times.
6. Remove the swab to prevent touching the tongue, pituitary, oral mucosa and saliva.
7. Immerse the swab head into the preservation solution containing 2 ~ 3ml virus.
8. Break the sterile swab rod near the top, discard the tail, tighten the tube cover and close it with sealing film.
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