How is an ectopic pregnancy commonly diagnosed?

• A. CT scan of the abdomen
• B. Ultrasound of the pelvis
• C. Blood hCG levels
• D. MRI of the pelvis

Answer: (B)

An ectopic pregnancy is primarily diagnosed through a pelvic ultrasound, which is instrumental in visualizing the reproductive organs and determining the location of the pregnancy. A transvaginal ultrasound is particularly useful because it allows for better visualization of early pregnancy structures. The ultrasound can help identify whether a gestational sac is located within the uterus or outside, which is indicative of an ectopic pregnancy.

In addition to ultrasound, measuring blood hCG levels can also support the diagnosis. However, while hCG levels can indicate pregnancy, they are not definitive for determining the location of the pregnancy. Elevated or declining levels can provide context, but they do not visualize anatomical locations directly.

Other imaging methods, like a CT scan or MRI, are less common for this diagnosis due to their higher exposure to radiation or because they are not as effective in visualizing early pregnancy conditions as an ultrasound. Hence, ultrasound remains the standard and most effective initial diagnostic tool for suspected ectopic pregnancies.