Under which of the following conditions must gonads be shielded?

• A. 1. the patient is of a reproductive age
• B. 2. the shield will not interfere with the exam/diagnosis
• C. 3. the gonads lie within 5cm of the primary beam
• D. choices2a3b4c

Answer: (D)

Gonadal shielding is used to reduce radiation dose to the reproductive organs whenever it can be done without compromising the quality or usefulness of the exam. If the patient is of reproductive age, there’s a real possibility that protecting the gonads matters for future fertility and cancer risk, so shielding is considered. But shielding must not interfere with obtaining the necessary diagnostic information; if placing a shield would obscure essential anatomy or make the image nondiagnostic, you should not shield. Additionally, shielding is especially important when the gonads lie within about 5 cm of the primary beam because the dose to the gonads would be higher in that scenario.

When all three conditions are met—patient of reproductive age, shielding would not interfere with the exam, and the gonads are close to the primary beam—the use of gonadal shielding is indicated. That’s why the answer is all of the above. Relying on only one factor isn’t sufficient, since the other requirements ensure the shield is both beneficial and safe for the diagnostic outcome.