Nasal swab test

Also known as a nasopharyngeal swab or aspirate, and pertussis testing

A nasal (or nasopharyngeal) swab is used to diagnose upper respiratory tract infections, such as whooping cough. It is a quick, painless test that can be completed in your doctor's office.

In this test, secretions from the back of your nose and upper throat are collected using a swab. Sometimes, a suction device may be used to gently remove the secretions. This is known as a nasal (or nasopharyngeal) aspirate.

The secretions are sent to a laboratory where they are grown. This makes it easier to identify which viruses, bacteria or fungi are present. The results are sent back to your doctor who will use them to help diagnose what germs could be causing your symptoms.

How is a nasal swab done?

To do a nasal swab, your doctor will insert a small, soft-tipped swab into each of your nostrils and twirl it a few times until it is covered in secretions. This may be a little uncomfortable but should not be painful. 

How is a nasal aspiration done?

If your doctor uses the nasal aspiration method, a small tube will be inserted into your nostril. This tube is connected to a suction device, which gently removes secretions from your nose. This will be repeated on the other nostril.

Learn more

The following links provide further information about nasal swab testing. Be aware that websites from other countries may have information that differs from New Zealand recommendations.   

Nasopharyngeal aspirate Medline Plus, US
Pertussis – laboratory testing Manual for the surveillance of vaccine-preventable diseases, Centers for Disease Control and Prevention, US 
Best practices for health care professionals on the use of Polymerase Chain Reaction (PCR) for diagnosing pertussis Centers for Disease Control and Prevention, US 

Credits: Health Navigator Editorial Team. Reviewed By: Gwenda Lawrence, medical laboratory scientist, Auckland Last reviewed: 16 Mar 2020