| ILB | infant, low birth [weight]; initial lung burden |
|---|---|
| ILBW | infant, low birth weight |
| IUPTB | intrauterine pregnancy, term birth |
| LB | lamellar body; large bowel; left breast; left bronchus; left bundle; left buttock; leiomyoblastoma; ... |
| LBW | lean body weight; low birth weight |