So I would strongly encourage you and your family to be screened annually for this, as it is SO MUCH easier to prevent iron overload than it is to treat it. Ferritin Screen â One of Your Most Important Health Tests Checking your iron levels is easy and can be done with a simple blood test called a serum ferritin test. I believe this is one of the most important tests that everyone should have done on a regular basis as part of a preventive, proactive health screen.