title: Routine diagnostic radioisotope investigations.
mesh_terms: D004905:Erythrocyte Aging; D006801:Humans; D007501:Iron / Q000378:metabolism*; D011868:Radioisotopes; D013960:Thyroid Function Tests; D014806:Vitamin B 12 Deficiency / Q000175:diagnosis*
chemical_list: D011868:Radioisotopes; D007501:Iron