The physician wrote the order to have the wound dressing changed bid. The nurse knows the abbreviation used means:

A)three times a day
B)twice a day
C)four times a day
D)every 6 hours

B) twice a day

The abbreviation "bid" in the context of a wound dressing change means "twice a day." Therefore, the nurse should change the wound dressing twice a day as per the physician's order.