Q: My child has had a fluctuating mild fever for almost two weeks. Do we need a blood test?

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Question:

Hello, I have a question regarding my child's body temperature. For almost two weeks, my child's temperature has been fluctuating. Before bedtime, it reaches 37.6-37.8°C, but once asleep, it drops to around 36.5°C. During the day, it ranges between 36.9-37.5°C.

It is definitely slightly higher than usual, but the temperature repeatedly goes up to around 37.8°C and then back down to normal, rather than staying constantly elevated. I am wondering if we need to get a blood test done.

The child's overall condition is completely normal, and there are no other symptoms besides allergic rhinitis. Is it okay to just keep observing? Or should we find the cause through a blood test? We visited an ENT clinic a couple of days ago, and the doctor said there were no issues in the nose, throat, or ears that would cause a mild fever. I would appreciate your professional opinion. Thank you.

Answer:

Hello. I understand you are very worried about the mild fever lasting for two weeks. It is a relief that your child is maintaining a normal overall condition.

The temperature of 37.6-37.8°C you mentioned is at the upper limit of the normal body temperature range. It is perfectly normal for body temperature to naturally rise by about 0.5-1°C, especially in the evening. Dropping to 36.5°C after falling asleep is also a normal circadian rhythm.

【Current Situation Assessment】

• Child's condition is good → Not an emergency

• No abnormalities found in the ENT exam → Low probability of an acute infection

• Consistent temperature pattern → More likely a mild cause rather than a serious illness

【Possible Causes】

1. Chronic inflammation due to allergic rhinitis

2. Recovery phase after a mild viral infection

3. Active metabolism during the growth period

4. Changes in indoor temperature or activity levels

【Recommendations】

→ Observe for 1 more week: Continue recording the temperature and checking the pattern.

→ When to consider visiting a pediatrician:

• Fever of 38°C or higher persists

• Weight loss or decreased appetite

• Fatigue or decreased activity

• If the symptom persists for more than 3 weeks

At present, a blood test does not seem strictly necessary. However, if you continue to feel anxious as a parent, it would be a good idea to consult a pediatrician to determine whether a test is needed.

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

https://fevercoach.us