Login to South West London Pathology Services

If you have any queries about pathology consumables – you need a new account or you have a query about your order, please telephone 020 8266 6827. Forgotten your password

Pernasal Swab

Category Bacteriology Medical Microbiology
Reporting frequency TAT - Culture results are available from 7 days

Collection conditions

Sterile Liquid Amies Medium with fine flexible twisted wire shaft rayon bud swab for nasopharyngeal specimens. Sample the posterior nasopharynx using a nasopharyngeal swab (NPS) or pernasal swab (PNS). The PNS needs to be gently pushed along the floor of the nasal cavity towards the posterior wall of the nasopharynx as this is where the B. pertussis bacteria are most likely to be found. After sampling, place the PNS for culture in transport media and transfer it without delay to the laboratory for processing. Sampling of nasopharyngeal secretions in patients with whooping cough may precipitate a paroxysm of coughing and cause obstruction of the airways. Resuscitation equipment must be available if whooping cough is suspected. The specimen collector should avoid exposure to direct coughs from the patient

Additional information

Timing the specimen collection is important. Sensitivity decreases with patient age and also decreases with time after onset and is highly dependent on specimen quality. Sensitivity decreases substantially, from approximately 60% within 1 week of symptom onset to culture to 10% or less after 4 weeks. This means it is vital to have accurate details about the onset of symptoms on the patient request form.

Lab Tests Online UK

Lab Tests Online - UK is a website written by practising laboratory doctors and scientists to help you understand the many clinical laboratory tests that are used in diagnosis, monitoring and treatment of disease.

Click here to go to Labtestsonline.org.uk

  • Search Tests

Latest news

January 15, 2021

New research shows that previous Covid-19 infection offers up to 94% protection from reinfection

A study carried out by Microbiologists at St George’s Hospital, using test data from South West London Pathology (SWLP) laboratories, shows that patients with laboratory evidence of Covid-19 in the first wave of the pandemic were 94% protected against reinfection in the second wave.

Read more
December 1, 2020

South West London Pathology launches new website

The new website offers a clear and simple navigation, a detailed test database with an easy-to-use search function and a consumables section which is linked to the test database, making it easy for users to find the type of container (test tubes, urine pots etc) that they need for specific tests.

Read more
November 13, 2020

Pathology service update: processing of allergy samples

Due to staffing pressures at the Immunology laboratory at St George’s Hospital, it is anticipated that allergy blood tests will be processed with an extended turnaround time of up to three weeks. This is expected to last through November and December.

Read more
November 12, 2020

SWLP to introduce Enhanced Liver Fibrosis (ELF™) Test

At the beginning of 2021, South West London Pathology (SWLP) will be introducing the Enhanced Liver Fibrosis (ELF™) Test from Siemens to our repertoire. The test can initially be requested by GPs in the borough of Wandsworth.

Read more