| INK | injury not known |
|---|---|
| IPB | injury-prone behavior; integrated problem-based curriculum |
| ISI | infarct size index; initial slope index; injury severity index; Institute for Scientific Information... |
| ISS | idiopathic short stature; injury severity score; International Society of Surgery; ion-scattering sp... |
| LBI | low back injury; low serum-bound iron |