In pregnancy, which imaging modality is preferred to evaluate potential urinary tract complications?

• A. Pelvic X-ray
• B. CT abdomen
• C. Renal ultrasound
• D. MRI pelvis

Answer: (C)

In pregnancy, avoiding fetal radiation is a central priority, so the preferred imaging approach for evaluating urinary tract concerns is renal ultrasound. Ultrasound uses sound waves, has no ionizing radiation, and is safe for both mother and fetus. It can reliably visualize the kidneys, collect system, and bladder to detect hydronephrosis or obstruction, which are common concerns during pregnancy due to hormonal effects and uterine compression. It also allows serial exams to monitor changes without risk. Other modalities involve radiation (pelvic X-ray, CT) or are less practical as first-line in pregnancy; MRI avoids radiation but is typically reserved for cases where ultrasound is inconclusive or more detailed soft-tissue characterization is needed. Therefore, renal ultrasound is the best initial test to evaluate potential urinary tract complications in pregnancy.