| AEI | arbitrary evolution index; atrial emptying index |
|---|---|
| AHI | active hostility index; Animal Health Institute; apnea-plus-hypopnea index |
| BI | background interval; bacterial or bactericidal index; base-in [prism]; basilar impression; Billroth ... |
| CPI | California Personality Inventory; Cancer Potential Index; congenital palatopharyngeal incompetence; ... |
| EPI | echo planar imaging; electronic portal imaging; Emotion Profile Index; epilepsy; epinephrine; epithe... |