The 24 weeks fetal 4D ultrasound reference values are as follows. The contents of the standard ultrasound data at 24 weeks of pregnancy generally include the average of the biparietal diameter, abdominal circumference, and femur, as well as the normal fetal heart rate, the thickness of the placenta, and the vertical depth of the amniotic pool. 1. the average value of the biparietal diameter of the fetus at 24 weeks is 6.05±0.5 centimeters; 2. mean abdominal circumference 18.74 ± 2.23 cm; and 3. mean femur length 4.36±0.51 cm; 4. Normal fetal heart rate should be 110-160 beats per minute; 5. normal placental thickness should be between 2.5 and 5 centimeters; 6. Ultrasound indicates the vertical depth of the largest pool of amniotic fluid, the depth of amniotic fluid 3-8 centimeters is the normal amount of amniotic fluid, less than or equal to 2 centimeters suggests that there is too little amniotic fluid, greater than or equal to 8 centimeters suggests that there is too much amniotic fluid. 24 weeks pregnant fetal 4D ultrasound test values have a certain standard reference range, if it is not within the normal range, it should be taken seriously, timely medical attention, clear reasons, symptomatic treatment.