Administration of radiographic contrast medium after a prior adverse reaction.
D003287:Contrast Media / Q000009:adverse effects*; D004155:Diphenhydramine / Q000627:therapeutic use; D006801:Humans; D011292:Premedication; D014581:Urticaria / Q000139:chemically induced* / Q000517:prevention & control
D003287:Contrast Media; D004155:Diphenhydramine