The amniotic fluid index is obtained by adding up the depth of amniotic fluid in the four areas, centered on the umbilicus of the pregnant woman and divided into four areas: upper, lower, left, and right. The amount of amniotic fluid increases gradually as the fetus grows, so what are the standards for the amniotic fluid index at different times? I. Amniotic fluid depth B ultrasound examination indicates the vertical depth of the largest amniotic pool, less than 2cm means too little amniotic fluid, more than 8cm means too much amniotic fluid. It is a medical term and an important indicator to determine how much amniotic fluid is present. Ultrasound examination indicates the vertical depth of the maximum amniotic fluid pool, the amniotic fluid depth of 3-8cm is normal amniotic fluid. Less than 3cm indicates too little amniotic fluid, more than 8cm indicates too much amniotic fluid. The amniotic fluid index is divided into four quadrants: upper left, upper right, lower left and lower right, and the sum of the vertical depth of the maximum amniotic fluid dark area in the four quadrants is the AFL. The measurement of amniotic fluid is an important indicator to assess whether the pregnancy is normal or not. However, it is difficult to assess the amount of amniotic fluid correctly because of the layer of the belly. At present, most hospitals use ultrasound to understand the status of the amniotic fluid volume and adopt the “amniotic fluid index method” to determine whether the amniotic fluid volume is normal. The method is to divide the uterus into four quadrants, measure the maximum depth of amniotic fluid in each quadrant, and then add them together to find the sum. The sum is within the range of 8 to 27 centimeters, less than 8 is too little amniotic fluid, more than 24 is too much amniotic fluid. The amount of amniotic fluid should be kept moderate to ensure a healthy pregnancy. Too much or too little can be detrimental, and sometimes even fatal. Therefore, it is advisable for pregnant mothers to insist on regular pregnancy check-ups.