label: Elevated bone marrow ring sideroblast count
label_lc: elevated bone marrow ring sideroblast count
description: "Count of ring sideroblasts in the bone marrow above the upper limit of normal. Ring sideroblasts are nucleated erythroblasts with a pathologic accumulation of iron granules in the mitochondrial matrix. They can be detected by Prussian blue staining as blue perinuclear aggregates in bone marrow aspirate erythroblasts."