title: Some sources of error in thyroxine screening in neonates by radioimmunoassay of whole blood spotted on blotter paper.
mesh_terms: D006801:Humans; D007231:Infant, Newborn; D008403:Mass Screening; D010209:Paper; D011863:Radioimmunoassay / Q000379:methods; D013959:Thyroid Diseases / Q000175:diagnosis; D013974:Thyroxine / Q000097:blood*
chemical_list: D013974:Thyroxine