Q - Every 

QHS - Every Night 

QID - Four times per day 

QOD - Every Other Day

exam:Digoxin 0.25 mg po qod

q.d. = once a day (from "quaque die", once a day)

  q.i.d. = four times a day (from "quater in die", 4 times a day)

 q.h. = every hour

  q.2h. = every 2 hours

 q.3h. = every 3 hours

  q.6h. = every 6 hours

exam: Ampicillin 500 mg po q6h

R/O - Rule Out 

R/I - Rule In 

SC - Subcutaneous 

SQ - Subcutaneous 

STAT - Immediately 

S - Without 

TX - Transfusion; Treatment

TID - Three times per day 

UCX - Urine Culture

UC - Ulcerative Colitis 

VS - Vital Signs 

W/O - Without 

W/U - Work-Up