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Q: My child has a mild fever after taking antipyretics. Should we still get a flu test?

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:

We went to the clinic yesterday for my child's mild fever. The doctor mentioned the throat wasn't swollen, but since the flu is currently widespread, they advised us to come back for a flu test if the fever continues today. The prescribed medicine included a fever reducer. However, at dawn, the temperature spiked to 38.5°C, so I alternated fever reducers. Currently, the temperature is hovering around 37.7°C. Should we still go in for a flu test even though it is only a mild fever right now?


Answer:

I understand your concern regarding the necessity of a flu test, especially after experiencing a sudden fever spike to 38.5°C at dawn.


Even though the fever seems mild right now, here is why a flu test is strongly recommended in your current situation:

  • Optimal Testing Window: The accuracy of a flu test is highest when performed within 48 hours of symptom onset.

  • Treatment Effectiveness: If the test is positive, antiviral medications (such as Tamiflu) can be prescribed, which can shorten the duration of the illness by 1 to 2 days.

  • Preventing Spread: A confirmed diagnosis allows you to take proper precautions to prevent the virus from spreading to other family members.

  • Masked Fever: Maintaining a temperature of 37.7°C while actively taking fever-reducing medication indicates that your child's underlying fever is actually much higher.


Signs that indicate a high probability of the flu include:

  • Sudden onset of fever

  • Systemic muscle aches and headaches

  • Extreme fatigue

  • Dry cough


It is important to get tested even if the fever feels mild. The flu is currently highly prevalent, making the chances of exposure significant. Furthermore, the flu often presents initially as a mild fever. Since children generally have a higher transmission rate than adults, early diagnosis is crucial.


I highly recommend visiting your pediatrician again today for an in-person evaluation and a flu test. Based on the results, your doctor will be able to provide the most appropriate and effective treatment for your child.


For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.







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