Iron studies in lead poisoning?

There's a question in UWorld where a lead poisoning patient has normal serum iron studies. In the explanation it says "(In lead poisoning) Iron studies are normal unless co-existing iron deficiency is present as well". Does anyone have any idea why that is? I was under the impression that - like all sideroblastic anemias - a lead poisoning patient would have increased serum iron, increased ferritin and normal to low TIBC. Goljan also lists iron studies in lead poisoning as having a... Iron studies in lead poisoning?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Step I Source Type: forums