COVID-19 Test

A COVID-19 test checks a sample for signs of infection and helps guide sensible next steps.

Different tests look for different markers. A rapid antigen test usually uses a nasal swab and looks for viral proteins. A laboratory molecular test, often called a PCR test, looks for genetic material from the virus. The right option depends on symptoms, recent exposure, local requirements and how quickly a result is needed.

For a nasal swab, a trained person or the test instructions guide a soft swab just inside the nostril. The sample is then processed on site or sent to a laboratory. Some molecular tests use a throat-and-nose sample or saliva, depending on the service. Sample collection is brief and you can usually return to normal activities straight away.

Swab testing is generally low risk. It can cause short-lived watering eyes, sneezing or nasal irritation. Accuracy depends on the test type, how the sample was collected, and the timing of testing in relation to symptoms or exposure. A negative result does not always rule out infection, particularly when symptoms continue or the test was taken early.

A positive result indicates that the test found evidence consistent with COVID-19. Follow the current instructions given by your healthcare professional, workplace, school or local health authority, including advice about reducing contact with others. Seek clinical advice promptly if you are at higher risk of severe illness or your symptoms worsen. An unclear result may require a new sample or a different test.

Test selection is a clinical and practical decision. Tell the testing provider about symptom onset, known exposure, medicines and any difficulty with nasal sampling.

Testing may be considered for people with respiratory symptoms, after close contact with someone who has COVID-19, before visiting a vulnerable person, or when a workplace or travel provider asks for it. Symptoms such as fever, cough, sore throat, runny nose or changed taste and smell can occur with COVID-19 as well as other infections. Urgency is guided by severe symptoms, such as trouble breathing, persistent chest pain, confusion or difficulty staying awake; seek urgent medical help for these.

Bring identification if the provider requests it and follow any preparation instructions. Explain when symptoms began and whether you have had recent contact with a confirmed case. The provider collects the sample, labels it and explains when and how results will be delivered. Keep the result available if you need to share it with a clinician or organisation.

There is no recovery period after a routine swab. Mild irritation normally settles soon after collection. While waiting for a result, follow the advice given at the test site and take practical steps to avoid exposing people who may become seriously unwell.

The main limitation is that a result is a snapshot. Testing too early, collecting too little sample material or using a test outside its instructions can produce a misleading result. A clinician may recommend repeat testing or an alternative method when the result does not fit the symptoms or exposure history.

A clinician can assess symptoms, examine you and consider other respiratory infections. Testing remains useful because symptoms alone cannot reliably distinguish COVID-19 from many other viral illnesses.

Choose a provider that explains which test it offers, how the sample is collected, when results are issued and what support is available if the result is positive or unclear. If you have a blocked nose, a recent nasal procedure or concerns about sampling, mention this before the test.