Q: My child has a persistent low-grade fever (37.8°C) and cold symptoms. Should we return for a flu test tomorrow?

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:

This morning, my child's hands and forehead felt warm. I checked their temperature, and it was 37.5°C. An hour later, it went up to 37.8°C. We visited a clinic and received a prescription. The symptoms include a stuffy nose, eye discharge, a runny nose, mild phlegm, and a slight cough. At the clinic, they checked the temperature multiple times and noted that the child didn't have a high fever at that time. The doctor mentioned the lung sounds were clear, so there was no severe underlying cause, but advised us to return tomorrow for a flu test if the fever persists.

Currently, the temperature is fluctuating between 37.5°C and 37.8°C; it hasn't gone any higher. My concern is: if the temperature remains at 37.8°C tomorrow, should we really go back to the clinic? I am wondering if taking a flu test is necessary for a low-grade fever.

Answer:

I understand you are worried about your child's persistent low-grade fever. Currently, your child is experiencing temperatures between 37.5°C and 37.8°C, which falls into the category of a low-grade fever (normal body temperature is generally 36.5°C to 37.5°C). This is accompanied by upper respiratory infection symptoms such as a stuffy nose, runny nose, and phlegm. Fortunately, their lung sounds are normal, and their overall vitality appears to be good.

Regarding whether to visit the clinic tomorrow for a flu test:

• You should take your child back to the doctor if the fever rises to 38.0°C or higher, or if they seem to be struggling.

• If the temperature remains around 37.8°C and the symptoms do not worsen, it is generally safe to continue observing them at home.

• Please keep in mind that a flu test is most accurate when performed within 48 hours of the onset of symptoms, so your doctor's recommendation was likely based on this timing window.

For home care management:

1. Encourage plenty of fluid intake (such as warm water or mild caffeine-free tea) to keep them well-hydrated.

2. Use a humidifier to help relieve their nasal congestion.

3. You may administer pediatric fever reducers if your child is visibly uncomfortable or fussy.

⚠️ Seek immediate medical evaluation if you notice any of the following red flags:

• A high fever of 39.0°C or above.

• Difficulty breathing or chest tightness.

• The fever persists for more than 3 days.

• The child is extremely lethargic, weak, or refuses to eat or drink.

Try not to worry too much if it remains just a low-grade fever. The most important factor is to closely monitor your child's overall condition and energy levels. If you are ever in doubt or if their condition changes, please follow up with your pediatrician for an in-person evaluation.

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

fevercoach.us

Apple App Store

Google Play

🌐 Also available in: Español · 한국어