what tests should I ask for?

[Guest guest]

Hi, I have an 8-year-old son who has low body temp. I give him a

children's vitamin with iron--anytime I take him off of it for a few

days, he complains of being tired and of muscle aches. Obviously, I

would like to have him tested for low-iron--but is there a specific

test I should ask for? I also want him tested for thyroid. What

tests should I ask for?

He has also been having some hand swelling lately. Not sure what that

might be. Arthritis? Any ideas on tests to ask for for that?

Thanks so much!