Why do a preliminary investigation for serum iron levels for a patient who suffers from excessive bleeding?

Answer 1

Iron deficiencies cause anemia and can hinder clotting. So before jumping to various hereditary and/or rare diseases, one tries to eliminate the more common "eating poorly"

Answer 2

It could be from hemophelia...or if someone is taking blood thinners, which contain serum iron, if they have taken too much of the medication they can suffer from excessive bleeding. The last possibility is a disfunction in the liver which can cause the same condition.