Q: Should my child get a flu test after being exposed to the flu, even if they do not have a fever?
Updated: Sep 7
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 child was exposed to a family member on Saturday who then tested positive for the flu on Monday. Before the exposure, my baby had an intermittent morning cough, but since yesterday, the cough and runny nose have worsened. We went to an evening clinic last night, and the doctor said the lungs are clear and the cough is likely due to postnasal drip. My child currently has no fever. Should we go back to the pediatrician today to get a flu test just in case?
Answer:
It is completely understandable to be concerned after your child was exposed to a confirmed case of the flu.
Based on your current situation, here is a clinical assessment regarding the timing of a flu test:
While antiviral medications for the flu are most effective when started within 48 hours of symptom onset, an immediate flu test is not strictly urgent right now. This is because your child currently has no fever, their lung sounds were clear upon recent examination, and the symptoms are primarily isolated to postnasal drip.
However, you should visit the pediatrician for an evaluation and discuss a flu test if any of the following occur:
• A fever of 38°C (100.4°F) or higher develops.
• There is sudden lethargy or a severe drop in appetite.
• Your child exhibits rapid breathing or seems to be having difficulty breathing.
• The cough becomes severe during the night, preventing them from sleeping.
In the meantime, you can safely manage the current symptoms at home with the following steps:
• Use saline nasal drops followed by a nasal aspirator to clear mucus, which will help relieve the postnasal drip.
• Ensure your child stays well-hydrated by offering plenty of fluids.
• Slightly elevate your child's upper body while they sleep to reduce nighttime coughing.
• Keep a symptom log tracking any signs of fever, cough frequency, and changes in eating, sleeping, or activity levels.
If you remain uncertain, a good next step is to call your pediatrician's office directly. You can explain the exposure, note the worsening cough and runny nose, and mention the lack of fever to see if they prefer you to come in for a test now or wait. Please continue with the supportive home care measures and consult your doctor promptly for an in-person evaluation if a fever develops or if symptoms worsen.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
