| OB-US | obstetrical ultrasound [examination of the fetus] |
|---|---|
| OC | obstetrical conjugate; occlusocervical; office call; on call; only child; optic chiasma; oral contra... |
| EUA | Examination Under Anesthesia |
| AC | abdominal circumference; abdominal compression; absorption coefficient; abuse case; acetate; acetylc... |
| ANA | acetylneuraminic acid; American Narcolepsy Association; American Neurological Association; American ... |