O.T. or OT
Occupational Therapy

O2
Oxygen

O2SAT
Oxygen Saturation

Ob
Obstetrics

Ober's test
A test designed to determine the presence of a shortened (tight) iliotibial band. With the patient lying on one side, the lower limb closest to the table is flexed. The other lower limb, which is bein...Full Definition

Ob-GYN
Obstetrics and Gynecology

OBS
Organic Brain Syndrome

OCT
Oxytocin Challenge Test

OD
Oculus Dexter = Right Eye; Overdose

ODonoghue's Maneuver
In patients with true physiologic pain, passive range of motion is greater than active range. If the patient's active range of motion is greater, it is a positive behavioral sign.

OJI
On the Job Injury

OOB
Out of Bed

OPC
Outpatient Clinic

OPD
Outpatient Dispensary

Ophth
Ophthalmology

OR
Operating Room

Orth
Orthopaedics

OS
Oculus Sinister = Left Eye

OT
Old Tuberculin

OTC
Over the Counter

OU
Oculus Uterque = Both Eyes Together

Over-reaction
Exagerrated, non-reproducible response to stimulus. A patient may be hypersensitive to light touch at one point during the examination but later give no response to touching of the same area. A disp...Full Definition

oz
Ounce