| UE | uncertain etiology; under elbow; uninvolved epidermis; upper esophagus; upper extremity |
|---|---|
| UO | under observation; undetermined origin; urethral orifice; urinary output |
| u/o | under observation |
| AC | abdominal circumference; abdominal compression; absorption coefficient; abuse case; acetate; acetylc... |
| ANA | acetylneuraminic acid; American Narcolepsy Association; American Neurological Association; American ... |