How thick is the placenta?

Pregnant women must pay attention to the results of prenatal examinations, because it can not only show whether the baby is healthy in the belly, but also judge whether the mother is healthy and whether the mother can give birth to the baby through natural delivery. The placenta is the place that provides food for the baby. It can be divided into four stages. The doctor can judge whether the due date has arrived based on the negotiation stage. So how thick is the normal placenta?

Normal placenta standards

1. The thickness of a normal placenta is 2.5-3.8 cm, and the thickest should not exceed 5 cm. A placenta that is too thick or too thin is abnormal. As long as your placenta thickness is within the normal range, there is no need to worry. In the late pregnancy, you should regularly check the placenta grade to ensure the normal development of the fetus.

2. The normal [full-term] placental thickness measured by B-ultrasound is 3.6-3.8 cm, usually not exceeding 5 cm. Under abnormal circumstances, the placenta may be enlarged. Conditions such as blood type incompatibility and diabetes can cause the placenta to be thicker than 5cm. Placental thickening generally indicates complications of the pregnant woman or abnormalities in the growth of the fetus in the uterus. (The normal thickness of the placenta during pregnancy should be between 25 and 50 mm) The membranous placenta is characterized by a large and thin placenta, which is prone to bleeding in the second trimester of pregnancy. If the placenta is small, it can lead to intrauterine growth retardation of the fetus and low birth weight at full term.

3. The placenta is a transitional organ for the exchange of substances between mother and child during pregnancy in metatherian and eutherian mammals, formed by the combination of the embryo's embryonic membrane and the mother's endometrium. The fetus develops in the uterus and relies on the placenta to obtain nutrition from the mother, while both parties maintain a considerable degree of independence. The placenta also produces a variety of hormones to maintain pregnancy and is an important endocrine organ.

4. Some reptiles and fish also reproduce by giving birth to their offspring live. The embryo grows some auxiliary structures such as yolk sac and gill filaments, which are closely integrated with the maternal tissues to achieve the exchange of substances between mother and child. This structure is called a pseudoplacenta.

5. There are two independent circulatory systems in the placenta, one for the fetus and the other for the mother (even if it develops to the sinusoidal endothelial type, such as in the late rabbit embryo, there is still a layer of endothelial cells separating the two sides). The chorion can be regarded as a semipermeable membrane, and the area in which all the villi are in contact with the maternal blood is 7 to 14 square meters; when the maternal blood flows in the gaps between the villi and the fetal blood flows in the villi, substances can be exchanged.

What is the standard for placental thickness? On what basis do doctors judge it? Generally after pregnancy, doctors will arrange for expectant mothers to have regular prenatal checkups so that they can keep track of the health status of mother and baby at any time. What is the standard for placental thickness? In general, the thickness of the placenta is between 25 and 50 mm. According to the changes in the fetal chorion, placental light spots, and basement membrane, the maturity of the placenta can be divided into four levels: 0, I, II, and III. This is closely related to the development time of the fetus. The longer the pregnancy, the more mature the placenta.

What does placental thickness represent? What is the normal placental thickness?

Placental thickness can be measured by ultrasound. The thickness of a normal full-term placenta is about 36~38mm, generally not exceeding 50mm. Simply comparing the thickness of the placenta is not very meaningful, because the placenta will become thicker due to edema in cases of intrauterine infection or hemolysis. It is recommended to consult your obstetrician to determine whether further examination is needed. The membranous placenta is characterized by a large and thin placenta, which is prone to bleeding in the second trimester of pregnancy. If the placenta is small, it can lead to intrauterine growth retardation of the fetus and low birth weight at full term. The placenta thickness is 34 mm at 32 weeks of pregnancy and 31 mm at 37 weeks.