Common Abbreviations used by Doctors

Abbreviation	Description
Rx	Treatment
Hx	History
Dx	Diagnosis
q	Every
qd	Every day
qod	Every other day
qh	Every Hour
S	without
SS	On e half
C	With
SOS	If needed
AC	Before Meals
PC	After meals
BID	Twice a Day
TID	Thrice a Day
QID	Four times a day
OD	Once a Day
BT	Bed Time
hs	Bed Time
BBF	Before Breakfast
BD	Before Dinner
Tw	Twice a week
SQ	sub cutaneous
IM	Intramuscular . .
ID	Intradermal
IV	Intravenous
Q4H	(every 4 hours)
QOD	(every other day)
HS	(at bedtime)
PRN	(as needed)
PO or "per os" (by mouth)
AC (before meals)
PC	(after meals)
Mg	(milligrams)
Mcg/ug	(micrograms)
G or Gm	(grams)
1TSF ( Teaspoon)	5 ml
1 Tablespoonful	15ml
DDx	differential Diagnosis
Tx	Treatment
RTx	Radiotherapy
CTx	Chemotherapy
R/O	rule out
s.p	status post
PMH(x)	post medical history
Px	Prognosis
Ix	Indication
CIx	contraindication
Bx	biopsy
Cx	complication