Is fasting necessary for all ultrasound types?

Fasting is not required for all types of ultrasound procedures; rather, it is only necessary for specific types. Certain ultrasound tests, particularly those focused on the abdominal area, may require fasting to ensure clearer images of the organs being examined. This is because food and liquid in the stomach can obscure the view and hinder the examination of structures such as the liver, gallbladder, or pancreas.

In contrast, many other types of ultrasound, such as those performed on the heart (echocardiograms), thyroid, or obstetric ultrasounds, do not require fasting and can be conducted with an empty or full stomach. Understanding which tests necessitate fasting is critical for patients to prepare adequately and for clinicians to obtain optimal images for diagnosis. Thus, option B accurately captures the need for fasting being conditional rather than universal.