Maria:
Counts can drop pretty quickly, but you have to consider the trend that you've been seeing and the situation. If a person has IVIG and they have counts of 220k, they can drop to below 10k in a few days. However, if a person has counts of 220k and has been holding it for a while, it's unlikely that counts will drop that quickly (although it can happen due to an illness, medication or vaccine). Counts normally fluctuate and counting is not an exact science. People have had two different counts even from the same blood sample.
The thing to remember is that low counts are not a medical emergency. Symptoms can be depending on what they are. If your child is being medically monitored and you are vigilant, then you're already doing all that you can and should be doing.
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