title: Estimation of serum ferritin in blood obtained by heelstick.
mesh_terms: D001800:Blood Specimen Collection / Q000379:methods*; D005293:Ferritins / Q000097:blood*; D006365:Heel; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D011677:Punctures
chemical_list: D005293:Ferritins