Q: Will taking steroids affect a flu test result or mask flu symptoms?
- Myeongchan Kim, MD
- Jul 17
- 2 min read
Medically reviewed by Sang Hyun Ahn, MD
Content edited by Myeongchan Kim, MD
This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
Question:
My husband recently went to the clinic for a cough and body aches. His prescription doesn't include antibiotics, but he was prescribed steroids. He started running a fever this evening. If he actually has the flu, will taking steroids affect a flu test result or alter his symptoms?
Answer:
Let me explain how taking steroids affects both flu testing and the physical symptoms of the virus.
Flu Test Results
Steroids do not directly affect or invalidate flu test results.
• Rapid Antigen Tests: These tests detect the physical presence of the virus itself, so steroids do not interfere with the result.
• PCR Tests: These detect the viral genetic material and are similarly unaffected by steroid use.
Effects on Symptoms
Steroids work by suppressing inflammation, which means they can alter how the body presents symptoms:
• His fever may temporarily drop.
• Body aches and coughing might feel significantly less severe.
• However, the virus remains fully active in his body, meaning he is still contagious to others.
Precautions & Recommendations
• If you strongly suspect the flu, it is recommended to have him tested (or retested) the next morning. Tests taken very early in the illness can sometimes yield a false negative.
• Flu antiviral medications (such as Tamiflu) are most effective when started within 48 hours of symptom onset.
• To prevent the infection from spreading to the rest of the household, ensure he wears a mask, rests in a separate room, and that everyone practices thorough handwashing.
Even while taking steroids, if flu symptoms such as a high fever, severe muscle aches, or a persistent cough continue, please have him follow up with his doctor for a re-evaluation. If he develops any warning signs like shortness of breath or chest pain, visit the emergency room immediately.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
![📢 [Important Notice] Create an account on the FeverCoach App before July 5 for lifetime free access](https://static.wixstatic.com/media/5d15bb_0dcb739a970c401396dac49bdafbb351~mv2.png/v1/fill/w_980,h_653,al_c,q_90,usm_0.66_1.00_0.01,enc_avif,quality_auto/5d15bb_0dcb739a970c401396dac49bdafbb351~mv2.png)
