Final answer:
In general, a 12-year-old female who is experiencing menstruation is highly unlikely to be pregnant, so a pregnancy test is not typically needed prior to surgery.
Step-by-step explanation:
In general, a 12-year-old female who is experiencing menstruation is highly unlikely to be pregnant. The onset of menses usually indicates the start of the reproductive cycle, and it is not common for females of this age group to become pregnant. Therefore, a pregnancy test is not typically needed prior to surgery for a 12-year-old female with menses.