The price of a twin 4D ultrasound is twice the price of a single fetus, usually around$500-800. Twins 4D ultrasound deformity screening not only screens a single fetus for malformations of the head, spine, limbs, chest, abdomen, including the liver, spleen, gallbladder, pancreas, both kidneys, ureter, bladder, gastrointestinal tract, and heart. It is also necessary to observe whether there are conjoined deformities between the twins, whether there are twin-to-twin transfusion syndrome and other deformities that are prone to occur in twins, and whether there is intertwining between the limbs of the twins, which makes the examination even more cumbersome, and so the price is relatively more expensive.