Relationship between radiation safety and Last
Menstrual Period (LMP) :
Before any radiological examination, the Last Menstrual
Period (LMP) should be routinely asked, especially in the
reproductive age group to prevent accidental exposure to
fetus.
If menstrual period is delayed, she should be considered
pregnant until proven otherwise.
Examinations utilizing Ionising radiation
should NOT be performed on pregnant
or suspected to be pregnant patients,
except in emergency and special
circumstances.
Radiological consent is mandatory after
adequate explanation is given to the
patient and husband or next of kin.
Most risk
1- 12 weeks
Least
Less
13- 28 weeks
29- 40 weeks
Radiation risks are most significant during organogenesis and in the
early fetal period, somewhat less in the 2nd trimester, and least in the
3rd trimester (ICRP P84 )
Radiology Services , Ministry of Health , Malaysia