Yes, there are several tests for strep throat, and the most common one takes only minutes. A rapid strep test performed in a doctor’s office or urgent care clinic can confirm or rule out a strep infection during a single visit, with results typically available in 5 to 10 minutes. If that test comes back negative but your symptoms are suspicious, a throat culture or molecular test can provide a more definitive answer.
The Rapid Strep Test
The rapid antigen detection test is the first test most people encounter. A clinician swabs the back of your throat and both tonsils, then runs the swab through a quick chemical analysis that detects proteins on the surface of group A strep bacteria. The whole process, from swab to result, usually wraps up in under 15 minutes.
The test is good but not perfect. It correctly identifies strep in about 86% of people who actually have it, and it correctly rules it out about 96% of the time. That high specificity means a positive result is reliable: if the test says you have strep, you almost certainly do. The gap is on the other side. Roughly 14 out of every 100 people with strep will get a falsely negative rapid test, which is why a backup test sometimes follows.
Throat Culture: The Gold Standard
A throat culture uses the same swabbing technique but takes a different path in the lab. Instead of looking for bacterial proteins on the spot, the sample is placed in a growth medium and incubated for 24 to 48 hours. If strep bacteria are present, they’ll multiply enough to be identified with high accuracy. This makes the culture more sensitive than the rapid test, catching infections the quick version misses.
The tradeoff is time. Because you’re waiting a day or two for results, treatment gets delayed. In practice, many clinics will start you on antibiotics based on strong clinical suspicion while waiting for culture results, then adjust the plan once those results come back.
Current guidelines from the Infectious Diseases Society of America recommend that children and adolescents with a negative rapid test should have a backup throat culture performed. For adults, a backup culture is generally considered optional because strep complications like rheumatic fever are much rarer in that age group.
Molecular Tests
Some clinics and hospitals now use molecular tests that detect strep DNA rather than surface proteins. These tests match the accuracy of a throat culture but return results in about 15 to 60 minutes, combining the speed advantage of a rapid test with the sensitivity of a culture. When a molecular test is used, a backup culture typically isn’t necessary even after a negative result, because the test is sensitive enough on its own.
Molecular testing is becoming more widely available but isn’t universal yet. Larger health systems and well-equipped urgent care centers are the most likely places to find it.
What the Swab Feels Like
All three tests start the same way: a clinician asks you to open wide and briefly rubs a long cotton swab against the back of your throat and both tonsils. It triggers a gag reflex in most people, which is uncomfortable but over in a few seconds. The swab needs to touch all three spots (both tonsils and the back wall of the throat) to collect a reliable sample. If the swab only grazes one area, the test is more likely to miss an actual infection.
At-Home Strep Tests
Over-the-counter strep test kits do exist, and they use the same rapid antigen technology found in clinics. However, no at-home strep test currently has FDA approval for direct-to-consumer use. The accuracy of these kits mirrors the rapid test’s 86% detection rate under ideal conditions, but proper swabbing technique matters enormously, and it’s harder to swab the back of your own throat correctly than you might expect. A poorly collected sample makes a false negative far more likely.
If you use an at-home kit and it comes back positive, that result is likely accurate and worth following up on with a healthcare provider for treatment. A negative result is less trustworthy, especially if your symptoms are classic strep: sudden sore throat, fever, swollen tonsils with white patches, and tender lymph nodes in the neck without a cough.
How Doctors Decide Whether to Test
Not every sore throat warrants a strep test. Clinicians often use a scoring system called the modified Centor criteria (also known as the McIsaac score) to gauge the likelihood of strep before ordering any test. The score assigns points based on five factors:
- Fever above 38°C (100.4°F): 1 point
- Swollen tonsils with white patches: 1 point
- Tender, swollen lymph nodes in the front of the neck: 1 point
- No cough: 1 point
- Age: 1 point if under 15, 0 points for ages 15 to 44, minus 1 point if 45 or older
A score of 0 or 1 suggests strep is unlikely, and testing may be skipped entirely. A score of 2 or 3 typically prompts a rapid test. A score of 4 or 5 indicates a high probability of strep, and some clinicians will begin treatment while confirming with a test. The presence of a cough, runny nose, or hoarseness usually points toward a viral infection rather than strep.
Cost and Where to Get Tested
Rapid strep tests are available at most primary care offices, urgent care clinics, and retail health clinics like MinuteClinic or Walgreens Healthcare Clinic. Retail clinics tend to charge in the range of $45 to $75 for the test itself, while urgent care visits that include a strep test can run $110 or more without insurance. With insurance, the test is typically covered as part of a standard office visit, though your copay applies.
Telehealth visits can help you get assessed, but they can’t perform a physical swab. If a video visit clinician suspects strep, they’ll direct you to an in-person location for testing. Some pharmacies now offer point-of-care testing with a pharmacist, which can be a faster and less expensive option depending on your state’s regulations.