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Rapid Tests
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Lab Tests

Rapid Tests

Rapid diagnostic tests (RDTs) provide quick results in 20 minutes or less, offering a convenient way to screen for infectious diseases and other conditions.

What are rapid tests?

Rapid tests are easy-to-use diagnostic tools that provide results quickly, often at a provider's office or at home. They typically involve testing a sample of blood, urine, saliva, or nasal secretions using a dipstick (a chemical-coated strip) or a rapid test cassette (a plastic case with a test well).

How are they used?

Rapid tests are commonly used to diagnose:

  • Flu
  • Strep throat
  • Malaria
  • HIV
  • COVID-19
  • Pregnancy

Advantages and Disadvantages

Advantages:

  • Fast results: Allows for quicker treatment, which can reduce symptom severity and limit disease spread.
  • Ease of use: Can be performed by trained non-medical workers or individuals at home.
  • Minimal equipment: Ideal for areas with limited access to specialized laboratories.

Disadvantages:

  • Lower sensitivity: They are less effective than standard lab tests at detecting diseases in the earliest stages of infection.
  • False negatives: It is more common for a rapid test to incorrectly show a negative result when the disease is actually present.

Because of these limitations, providers may follow up a negative rapid test with a standard lab test to confirm the results. If you receive a negative result on an at-home test, instructions may recommend re-testing after a specific period.

Frequently Asked Questions

While rapid tests for conditions like HIV and malaria are available, they are generally intended for screening rather than definitive diagnosis in a home setting. A positive result on an at-home rapid test requires immediate confirmation by a healthcare professional through standard laboratory testing. A negative result may also require follow-up testing depending on the timing of your last potential exposure, as there is a window period where the infection is present but not yet detectable by the test.
negative rapid test does not always rule out an infection, especially in the early stages when viral or bacterial loads are low. If you continue to experience symptoms or have a high-risk exposure, contact your healthcare provider. They may recommend a more sensitive standard laboratory test, such as a PCR or culture, to confirm or rule out the diagnosis. Do not ignore persistent symptoms just because a quick test was negative.
Rapid tests are designed for speed and convenience, which often comes at the cost of slightly lower sensitivity compared to standard laboratory tests. This means they are more likely to produce a false negative, particularly in the very early stages of an infection when the pathogen level is low. However, they are highly specific, meaning a positive result is usually accurate. Clinicians often use rapid tests for immediate triage and follow up with lab tests for confirmation if the clinical picture is unclear.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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