| E/C | endocystoscopy; enteric-coated; estrogen/creatinine ratio |
|---|---|
| ECR | effectiveness-cost ratio; electrocardiographic response; emergency care research; emergency chemical... |
| E/I | expiration/inspiration [ratio] |
| EMR | educable mentally retarded; electromagnetic radiation; electronic medical record; emergency mechanic... |
| ETAR | equivalent tissue air ratio |