decreased circulating transferrin level abnormal circulating unsaturated transferrin level decreased circulating unsaturated transferrin level csmith MP:0011897 reduction in the concentration of transferrin that is not saturated (bound) with iron; this represents the reserve capacity of transferrin and is often measured by the Unsaturated Iron Binding Capacity (UIBC) test 2013-02-05T01:52:06Z decreased unsaturated iron binding capacity MPheno.ontology