My son scored low on one of these so I had a quick search to see the basics of what they are - his doctor will, of course, explain more fully. But, in the meantime, here is a quick overview:
http://www.cidpusa.org/IgG3deficiency.html
This is a little more technical:
http://ednieuw.home.xs4all.nl/IgGsubclasses/subkl4.htm
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