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A conservative approach used by some radiology facilities is to apply a 10-day rule only for examinations with the potential to deliver a high dose to the lower abdomen and pelvis, such as barium enemas and CT of the abdomen or pelvis. These facilities use a 28-day rule for all other examinations.
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10 day rule should be applied4. In practice this means that abdominal or pelvic CT and some barium studies should be scheduled in the first 10 days of their menstrual cycle. This timing refers to patients with a regular 28 day cycle and should be scaled according to cycle length. For further information on fetal doses, see Table 14.
The 10-day rule was established by the International Commission on Radiological Protection to minimize the potential for performing x-ray exams on pregnant women. The basis of the rule was to do abdominal and pelvic x-ray exams only during the 10 days following the onset of menstruation.
Application of the 10 day Rule - There are situations where 10 day rule can not be easily applied or is not appropriate egadolescents, peri menopausal females, previous hysterectomy etc.
The Health Protection Agency provides practical advice regarding the 10-day rule for what are classified as high-dose examinations.3 These are investigations resulting in doses to the uterus of ‘some tens of milligray’.
The former concept of the ‘10-day rule’ (which means that whenever possible, one should confine the radiological examination of the lower abdomen and pelvis to the 10-day interval following the onset of menstruation) has been considered obsolete for several years.
28 Ιαν 2014 · The Royal College of Radiologists: Recommendations on the implementation of “The 10-Day Rule”, British Journal of Radiology, Volume 49, Issue 578, 1 February 1976, Pages 201–202, https://doi.org/10.1259/0007-1285-49-578-201
