Imagine waking up with a sore throat, fever, and body aches—your mind instantly wonders, “Is it the flu or COVID-19?” Since both illnesses share similar symptoms, telling them apart can be difficult. But in such situations, using an at home flu test can give you quick answers without a visit to the doctor. Testing options have developed recently, but there is confusion regarding flu and COVID tests. This guide helps break down the key differences, testing options, and when to choose one over the other.
Understanding the Symptoms: Overlapping Yet Different
Flu and COVID-19 share many symptoms, so it is difficult to determine which illness you have based on how you feel. Fever, cough, fatigue, and body aches are common in both. However, some telltale signs set them apart.
- COVID-19 Symptoms: A key symptom that stands out is loss of taste or smell, which is rare with the flu. COVID can also lead to shortness of breath, lingering fatigue, and long-term complications in some cases.
- Flu Symptoms: The flu usually comes on suddenly with high fever, chills, muscle aches, and a severe headache.
Symptoms alone aren’t enough for an accurate diagnosis, but they can give you an idea about your condition before taking a test. 
Types of Tests for Flu and COVID
Testing is the only reliable way to confirm whether you have the flu or COVID-19. While both illnesses can be diagnosed through similar methods, the types of tests available differ slightly.
- COVID-19 Tests: The most common options are PCR and rapid antigen tests. PCR tests detect viral RNA and are highly accurate, but results take longer. Rapid tests provide results in minutes but may not be as precise, especially early in the infection.
- Flu Tests: Flu testing is less widely discussed, but rapid influenza diagnostic tests (RIDTs) are available and can detect flu viruses within 15 minutes. PCR-based flu tests are also an option, though they are typically done in clinics.
Can You Test for Both at Home?
Yes! At-home testing options for flu and COVID have become more accessible, allowing people to check their health without visiting a clinic. Many COVID-19 test kits are FDA-approved for home use, making them a convenient option.
If you think you have the flu, you can check at home. A flu test helps find the virus fast. You use a nasal swab to check for flu strains A and B. But these tests aren’t as easy to find as COVID tests. Some even need a doctor’s approval. Hence you might have to do a virtual check-up to get one.
When Should You Get Tested?
Taking a test too early or too late can impact accuracy and results.
- Flu Testing: The best time to test for the flu is within 48 hours of symptoms.
- COVID Testing: COVID-19 tests are most accurate when taken 3-5 days after exposure or as soon as symptoms appear.
If you experience severe symptoms, such as difficulty breathing or persistent chest pain, seek medical attention immediately instead of relying solely on at-home testing.
How Reliable Are These Tests?
No test is 100% accurate, but knowing their reliability helps set realistic expectations.
- COVID-19 Tests: PCR tests are the gold standard, with accuracy rates above 90%. Rapid antigen tests are convenient but may produce false negatives, especially if taken too early.
- Flu Tests: Rapid flu tests have a lower accuracy rate than PCR-based flu tests. They work well when flu cases are high but can sometimes miss cases.
To improve accuracy, always follow test instructions carefully and consult a healthcare provider if results are unclear.
Do You Need Separate Tests for Flu and COVID?
While some testing centers offer combo tests that detect flu and COVID-19, most at-home tests focus on one virus at a time. If you’re unsure of your illness, a healthcare provider may recommend testing for both, especially during peak flu season.
Combination tests benefit people with weakened immune systems or those at higher risk for complications. They provide a comprehensive diagnosis and help doctors prescribe the proper treatment faster.
Taking the Right Steps After Testing
Once you have your results, knowing what to do next is crucial.
- If You Test Positive for the Flu: Rest, stay hydrated, and consider antiviral medication if prescribed. Isolate to prevent spreading the virus.
- If You Test Positive for COVID-19: Follow CDC guidelines for isolation, monitor symptoms, and inform close contacts. Seek medical care if symptoms worsen.
- If You Test Negative but Feel Unwell: False negatives can happen, so if symptoms persist, consult a doctor or consider retesting.
Flu and COVID-19 share many similarities- that’s why testing is important. It helps to get the right diagnosis. Now, at-home flu tests and COVID-19 self-tests are available, and checking for these illnesses is easier than before. But picking the right test kit is crucial. You also need to take it at the right time. Finally, following the necessary precautions will help you recover quickly.