Ten days rule in radiology

   10 days rule in radiology

 The 10-day rule was established by the International Commission on Radiological Protection to minimize the risk of radiation exposure to a developing embryo or fetus during diagnostic X-ray examinations of the abdomen and pelvis.

The rule suggested that whenever possible, these X-ray exams should be confined to the 10-day interval following the onset of a woman's menstrual period.
The rationale behind the 10-day rule was the assumption that ovulation, the release of an egg from the ovary, typically occurs around the middle of a menstrual cycle. By performing the X-ray exam in the first 10 days after the menstrual period, it was believed that the likelihood of a woman being pregnant would be lower, and therefore, the risk of radiation exposure to an embryo or fetus would be minimized.

However, the 10-day rule has several limitations:

• It does not account for women with irregular menstrual cycles.

• Even in women with regular cycles, ovulation can vary from month to month.

• Early pregnancy may not be detectable within the first 10 days.