| LU | left upper [limb]; loudness unit; Lupron; lytic unit |
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| MICU | medical intensive care unit; mobile intensive care unit |
| mIU | milli-international unit; one-thousandth of an international unit |
| MRU | mass radiography unit; minimal reproductive unit |
| PFU | plaque-forming unit; pock-forming unit |
| lung unit | A respiratory bronchiole together with the alveolar ducts and sacs and pulmonary alveoli into which the respiratory bronchiole leads, considered by some to include the terminal bronchiole and its subdivisions, and called a pulmonary acinus. (05 Mar 2000) |
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