Rapid strep test: is it reliable?

What is a rapid strep test?

The rapid strep test is a quick diagnostic tool used to detect the presence of Group A Streptococcus bacteria, the culprit behind strep throat. This test is typically performed in a doctor's office or an urgent care setting like CityMD, and provides results within minutes.

Here’s how it works:

• Throat swab. A healthcare provider swabs the back of your throat to collect a sample.
• Testing. The sample is then exposed to a solution that identifies the presence of strep bacteria.
• Results. In as little as 10-15 minutes, the test will indicate whether strep bacteria are present. 

Quick tip: If your rapid strep test is positive, it means you have strep throat and need antibiotics. If it's negative, a follow-up test may be recommended, especially if strep throat is still suspected.

Is the rapid strep test reliable?

So, is the rapid strep test reliable? The answer is both yes and no, depending on the context.

• Accuracy. The rapid strep test is highly reliable when it returns a positive result. It’s about 95% accurate in detecting strep bacteria when they are present.
• False negatives. However, the test isn’t perfect. Sometimes, it may not detect the bacteria, resulting in a false negative. This occurs in about 5-10% of cases, so a follow-up throat culture may be recommended if symptoms persist despite a negative result.
• Follow-up testing. While a throat culture takes longer to provide results (24-48 hours), it is more accurate and can confirm a negative rapid strep test result.

Pro tip: If you or your child are experiencing symptoms like a severe sore throat, fever and swollen lymph nodes, and the rapid strep test comes back negative, ask your healthcare provider at CityMD about the possibility of a throat culture.

Benefits of rapid strep tests.

Despite the possibility of false negatives, the rapid strep test offers several benefits:

1. Speed. One of the most significant advantages is the speed of results. In just a few minutes, you can know whether you have strep throat and start treatment immediately if needed. 
2. Convenience. The test can be done quickly in a clinic or urgent care setting, making it convenient for busy individuals or parents with young children. 
3. Early treatment. Rapid results mean you can start antibiotics sooner, reducing the duration of symptoms and the risk of complications. 
4. Reduced contagion. Starting treatment quickly can also reduce the likelihood of spreading the infection to others.

When should you get a rapid strep test?

Here are some situations where a rapid strep test might be necessary:

• Persistent sore throat. If your sore throat doesn’t improve after a few days or it worsens, a strep test may be warranted.
• Fever. Accompanied by a sore throat, a fever is a common sign of strep throat.
• Swollen lymph nodes. If your lymph nodes are swollen and tender, it could indicate a bacterial infection like strep.
• Contact with strep. If someone in your household or close circle has been diagnosed with strep throat, you may need testing if you develop symptoms.

Rapid strep test reliability: final thoughts.

The rapid strep test at your local CityMD is a valuable tool in diagnosing strep throat quickly and effectively. While it’s generally reliable, understanding its limitations and the benefits it offers can help you make informed decisions about your health.

At CityMD, our healthcare professionals are here to provide accurate testing and guide you through the next steps, ensuring you receive the best care possible.