Ultrasonography is indicated in various conditions. The advantages of ultrasound are: - Can be performed at bedside i.e., portable - No ionizing radiations - Soft-tissue visualization - Non-invasive - Helps in guiding wires or drains - Amount and flow of blood in vessels - Helps visualize blockage in vessels e.g., atherosclerosis in carotid arteries - Can help visualize blood clots - Differentiation of solid and cystic masses - Essential for determining the gestational age Reference: https://europepmc.org/article/med/1840986