Referring to the data you provided (low iron saturation with normal iron binding capacity), it may be likely that your son might be experiencing an iron deficiency.
Iron deficiency in children might be caused by any of the following reasons: insufficient iron intake, insufficient iron absorption in the intestines, higher blood loss (often or severe bleedings), and increased needs for iron (during intensive periods of growth like puberty). If iron is not supplemented properly, then iron deficiency related anemia might be caused.
It might also be present in cases of frequent infections just as you reported.
So, as you can see, in most cases iron supplements are all that is needed.
However, the frequent infections need more investigation and you are advised to visit a hematologist for the anemia. You might be referred to a specialist in infective diseases or a specialist in immunology because of the frequent infections.
As for the iron supplements dosage please be aware that in children the iron dosage is lower depending on the age and the table formula. Otherwise, an iron overdosage might happen.
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