The most widely used method is ultrasound; yet many doctors are not capable of using it to make a detailed examination, and its cost--around NT $ 1000, or about US $ 25--makes it an economic burden for most patients.
但事實上，以國內醫院目前的人力、物力，並不足以應付這麼頻繁的檢查；而一次約新台幣一千元的費用，對產婦也多少是個經濟負擔。