O2
Oxygen
O&P
Ova and parasites
Ob;
Obs
Obstetrics
OBRA
Omnibus Budget Reconciliation Act
od
Overdose
oint
Ointment
OJ
Orange juice
OOB
Out of bed
OP
Out patient
OPD
OPC
Outpatient department or clinic
opp
Opposite
OR
Operating room
Ord
Orderly
Orth
Orthopedics
os
Mouth
OSHA
Occupational Safety and Health Administration
OT
Occupational therapist
OTC
Over the counter
OV
Office visit
oz
Ounce
__
p
After
P
Pulse
PA
Physician’s assistant
PAC
Premature atrial contraction