When many mothers-to-be get the ultrasound diagnostic report, they see a short paragraph and are confused, but in fact, the report sheet is nothing more than the following: fetal sac, fetal head, fetal heart, placenta and so on. The diameter of the sac is about 2 cm at 6 weeks of pregnancy and about 5 cm at 10 weeks of pregnancy. The location of the sac is normal at the fundus, anterior wall, posterior wall, upper part and middle part of the uterus; round, oval and clear shape is normal. AC – abdominal circumference A cross-section of the abdomen at the level of the umbilicus, perpendicular to the cristae, with the cristae, gastric vesicles, hilar quiet and liver visible in the plane. BDP – biparietal diameter The length of the widest part of the fetal head between the left and right sides, which should be 9.3 cm or more at full term. As a general rule, after 5 months of gestation, it basically corresponds to the month of pregnancy, that is, the BPD is about 7.0 cm at 28 weeks of gestation (7 months), 8.0 cm at 32 weeks of gestation (8 months), and so on. FL-femur length The length of the fetus’ thigh bone, also known as the thigh bone length. The thigh bone is the length from the root of the thigh to the knee. The FL is usually measured around 20 weeks of gestation to check the development of the fetus. HC – Head circumference Also called fetal head circumference, it is a numerical value that measures the length of one week of the head. It is used to confirm the developmental status of the fetus. H – Fetal heartbeat is seen on ultrasound at 7-8 weeks of pregnancy and at the end of the 6th week of pregnancy at the earliest. The normal frequency of the fetal heartbeat is between 120 and 160 beats per minute. CRL – head-rump length is the distance between the head and rump of the fetus, which is mainly used to determine the gestational age at 7-12 weeks of gestation. S/D is the ratio of fetal umbilical artery systolic pressure to diastolic pressure, which is related to the fetal blood supply. GP – Placenta grading is generally classified into 0, I, II, III and sometimes III+ grades. The placenta is generally classified as 0, I, II, III and sometimes III+. AFI – Amniotic fluid index When doing ultrasound, the amniotic fluid index is obtained by adding up the depth of amniotic fluid in 4 areas, with the umbilicus of the pregnant woman as the center, and the normal value of amniotic fluid index in late pregnancy is 8~18 (24) cm.