The Laboratory Performance Standards Committee of the Society for Cardiac Angiography and Interventions has devised guidelines to inform catheterization laboratory personnel about appropriate radiation monitoring and protection. A personal monitoring dosimeter must be placed over any radiation protective garments on the collar near the thyroid. A second dosimeter, worn at the waist level under any radiation protective garments, is mandatory for any declared pregnant workers exposed to radiation. This dosimeter is recommended, but not required, for all personnel in the catheterization laboratory. The limit for whole body radiation exposure is stated in terms of the effective dose equivalent (EDE). Different formulas are used for calculating the EDE, depending on the number of dosimeters worn simultaneously by the individual. Finger dosimeters should be worn by personnel whose hands are likely to be directly exposed to the x-ray beam. Initial and periodic training in radiation protection is a part of good laboratory practice.