Q: My child has had a low-grade fever for 6 days, but blood tests are normal. Should we do more tests?
- Myeongchan Kim, MD
- Jun 9
- 3 min read
Updated: Jul 8
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 has been having a low-grade fever for 6 days now. On the first day of the fever, we went to the clinic, and the doctor said there was mild throat inflammation but not enough to require antibiotics, so we just gave regular medication. However, the low-grade fever has continued. Oddly, the fever goes away completely when my child is sleeping.
Because the temperature wouldn't drop, we went back to the clinic a few days later. The doctor added antibiotics and suggested that since the fever has lasted a while after a previous flu infection, it might be another virus. They advised getting a blood test if the temperature went over 37.5°C. The next day, we went to a children's hospital for a blood test. The results showed zero inflammation levels (CRP) and a normal white blood cell count. The doctor still thinks it's due to the throat, but my child says their throat doesn't hurt at all.
The low-grade fever has been lingering for so long. Should we get other tests done? The temperature usually stays around 37.5°C to 37.6°C, but occasionally goes up to 37.9°C.
Answer:
It is completely understandable that you are worried since the low-grade fever has persisted for 6 days.
Summary of the Current Situation
• Low-grade fever (37.5~37.9°C) persisting for 6 days, but body temperature returns to normal during sleep.
• Diagnosed with throat inflammation; fever continued even after starting antibiotics.
• Blood test results: Inflammation level (CRP) is 0, and the white blood cell (WBC) count is normal.
• The child does not complain of throat pain.
Reassurance
Since the inflammation markers and white blood cell counts are completely normal, and there is no fever during sleep, the likelihood of a severe bacterial infection or a serious underlying illness is very low.
What You Can Do at Home
• Record temperature 3 times a day: Check immediately upon waking up, during afternoon activities, and before bedtime to understand the fever pattern.
• Monitor hydration, activity, appetite, and urine output: If your child is eating well, playing, and urinating a normal amount, these are very positive signs.
• Use fever reducers only when uncomfortable: Temperatures between 37.5°C and 37.9°C are considered low-grade. If your child is not visibly distressed, you can simply observe without giving fever-reducing medication.
• Adjust clothing and room temperature: Dressing the child too warmly or keeping the room too hot can artificially raise their body temperature.
Questions to Ask Your Doctor at the Next Visit
If you return for a follow-up, here are a few helpful questions to ask your pediatrician:
"Are additional tests (such as a urine test, chest X-ray, or viral panel) necessary right now, or is it safe to observe for a few more days?"
"Is there a chance that further test results will change the current treatment plan?"
"What specific symptoms should prompt an immediate return during the observation period?"
When to Seek Immediate Medical Evaluation
Please visit your pediatrician today, or go to the nearest emergency room (if after hours), if you notice any of the following red flags:
• Fever rising to 38.0°C or higher.
• Sudden lethargy, reduced eye contact, or poor responsiveness.
• No urine output for more than 8 hours.
• New onset of neck or joint pain.
• Accompanying symptoms like a rash, severe headache, or repeated vomiting.
Conclusion
While the recent blood test results are very reassuring, a low-grade fever lasting more than 7 days may eventually require further medical evaluation to rule out other causes. For now, start keeping a daily log of your child's temperature and activity levels. If any new symptoms arise, or if you remain concerned about the prolonged fever, please consult your pediatrician for an in-person follow-up and reassessment.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
