Do you want to get tested for influenza or COVID-19? You may be wondering what the difference is between a nasal swab test and a nasopharyngeal test. In this article, we explain the core differences between these two tests, and the swabs used to collect them.
What is the nasal swab method?
The nasal swab method is the collection of a diagnostic sample from the nasal membranes using a swab. The nasal swab test (often referred to as the anterior nasal test) involves inserting a swab into the nostril approximately .5-.75 inches deep, rotating it in one nostril for 10-15 seconds while touching the sides of the nasal wall, and then using the same swab and collecting it in the other nostril in the same manner. Because this method is less invasive, it is often more comfortable for the patient - and is the method used during self-testing.
Swabs used for the nasal collection method are usually medium-sized tips made of an absorbent material, usually flocked fiber, spun polyester or medical foam. The handle of the nasal swab used for this diagnostic test is usually made of polystyrene.
What is the method of nasopharyngeal swabbing?
The nasopharyngeal collection method collects a sample from the nasopharynx, which is the upper part of the throat behind the nose. In this test, a small pointed swab is inserted parallel to the chin into the nostril until resistance is felt. The swab is inserted no deeper than half of the distance between the nostril and the ear. The swab is then rotated several times while remaining in place, and then slowly removed while gently rotating. If the tip of the swab is completely saturated with the sample, it may not be necessary to collect the sample from both nostrils. This method is often less comfortable for the patient, but is not usually considered painful. This method is not recommended for self-testing and should only be performed by a healthcare practitioner.
Swabs for the nasopharynx are designed with a miniature tip made of ultra-fine flocked material and a thin, flexible handle usually made of polystyrene.
