A
ortho
orthopedics
OSHA
occupational safety and health administration
OT
occupational therapist, occupational therapy
OTC
over-the-counter (medication)
oz.
ounce
p
after
PA
physician assistant
PAD
peripheral artery disease
pc,p.c.
after meals
PCA
patient-controlled analgesia
PDR
prescriber's digital Reference
PE
pulmonary embolism
peds/peds
pediatrics
PEG
percutaneous endoscopic gastrostomy
PET
positron emission tomography
pH
parts hydrogen
pH
past history
PHI
protected health information
phy. ex.
physical exam
PID
pelvic inflammatory disease
PM/pm
afternoon
PMH
past medical history
PNS
peripheral nervous system
PO
by mouth (per os)
pos
positive