The normal value of the fetal middle cerebral artery decreases with each week of pregnancy, and the normal value needs to be determined in relation to the specific week of pregnancy.
1. Before 24 weeks of gestation: the normal value of S/D of fetal middle cerebral artery is 3.5-5.5, usually not more than 5.5.
2. 24-30 weeks of gestation: the normal value of fetal middle cerebral artery S/D is 2.5-5.0, usually not exceeding 5.0.
3. 30-36 weeks of gestation: Normal values for fetal middle cerebral artery S/D are 2.5-4, usually not exceeding 4.
4. 36-40 weeks of gestation: the normal value of S/D of the fetal middle cerebral artery is 1.7-3, and usually does not exceed 3.
The fetal middle cerebral artery belongs to the main blood vessels of the fetal brain and is a branch of the internal carotid artery of the brain. Measurements of the fetal middle cerebral artery can accurately reflect a variety of internal and external environmental changes, and thus accurately reflect pathological and physiological changes.
Therefore, it is recommended that pregnant women should pay attention to ensuring sufficient energy during pregnancy, increasing the intake of fish, meat and other nutrients, and taking regular pregnancy checkups so that abnormalities can be detected in time for timely treatment.