How long do COVID tests last?

Testing detects evidence in a particular sample at a particular moment. A positive result can remain detectable after you start feeling better, while a negative result can change if infection develops later or the sample was collected too early. The test does not show that you cannot catch COVID in the future. Use the test type, collection date and your symptoms together when deciding what the result means.

Read the instructions for the exact test and record when you took it. Follow current advice from the testing service about close contact, work or travel decisions. If you develop new symptoms after a negative test, ask whether repeat testing is appropriate. Do not use an old result to make decisions about a new illness. Seek advice from a pharmacist or clinician if you are unsure how medicines or a health condition affect your plan.

Get urgent help for severe breathing difficulty, chest pressure, new confusion, fainting, or inability to stay awake, regardless of an earlier test result. Arrange a clinical review for symptoms that persist or worsen, or for ongoing fatigue, joint pain, loss of smell, loss of taste, difficulty concentrating or low mood that affects daily activities.

How should I interpret this result given when my symptoms started? Should I test again, and when? Does my health history change the advice? Which warning signs should I watch for?