Whether amniotic fluid 35mm is normal or not depends on the specific index of that value. If the amniotic fluid index is 35mm it is not normal; while the depth of amniotic fluid 30mm is normal. 1. Amniotic fluid index: amniotic fluid index is abbreviated as AFI, clinically the uterus right angle through the umbilical cord level line and the midline of the abdomen is divided into four quadrants, the sum of the amniotic fluid of the four quadrants is called the amniotic fluid index. The normal range of amniotic fluid index is 50~250mm, if the amniotic fluid index is 35mm, it belongs to the situation of low amniotic fluid, which may be caused by fetal abnormality, overdue pregnancy and so on. 2. Depth of amniotic fluid: the depth of amniotic fluid refers to the value of vertical depth of amniotic fluid measured during ultrasound examination, and the normal range is 30~80mm. therefore, the maximum dark zone of amniotic fluid of 35mm is the normal value, so there is no need to worry too much, and you can follow up to observe the changes in the amount of amniotic fluid to prevent the occurrence of amniotic fluid hyponatremia. It is recommended that pregnant women should go to regular hospitals for routine prenatal checkups, according to professional doctors combined with specific clinical parameters, to determine whether the amniotic fluid indicators are normal or not, and if necessary, need to be treated.