Q: Fever reaching 38.5°C at night despite antibiotics for a throat infection. Is a retest needed?
- Myeongchan Kim, MD
- Jun 20
- 2 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 fever since Saturday. The temperature returns to normal after taking fever reducers. We got tested on Sunday, which came back negative. The doctor diagnosed it as a throat infection, so my child is currently taking antibiotics and fever reducers. However, the fever still spikes to 38.5°C every night, and we have been alternating different fever reducers (cross-medicating). Is it normal for a fever to last this long? We are visiting the doctor tomorrow—should we request another test?
Answer:
I understand your concern about the fever persisting for four days and spiking to 38.5°C at night.
Current Assessment:
• It is a positive sign that the fever comes down after taking fever-reducing medications.
• Fevers caused by a throat infection can typically last for 3 to 5 days.
• It usually takes about 48 to 72 hours for antibiotics to start showing their full effect.
Things to Discuss During Tomorrow's Doctor Visit:
The need for retesting: Ask if another test is needed, especially for the flu or other specific respiratory viruses.
Antibiotic response: The doctor will evaluate if the current antibiotics are working or if a change in medication is necessary.
Check for complications: The doctor should check for secondary infections like otitis media (ear infection) or pneumonia.
🚨 Go to the Emergency Room Immediately If:
• Your child experiences difficulty breathing or shortness of breath.
• There is a decrease in consciousness, severe lethargy, or lack of normal responsiveness.
• Your child refuses to drink fluids and has not urinated for more than 8 hours.
Fever Management Tips:
• If you are alternating different fever reducers (cross-medicating), maintain an interval of at least 2 to 3 hours between doses.
• Ensure your child stays well-hydrated with plenty of fluids (water or electrolyte drinks).
• Dress your child in light, breathable clothing.
A high fever lasting four days or more definitely requires clinical re-evaluation. Please make sure to attend your doctor's appointment tomorrow for a thorough in-person examination, and follow their professional guidance regarding any additional testing or treatment changes.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
