What is the purpose of prenatal pelvic measurement and when is it usually measured?

Hello, I'm "Jing Ma said" and I'm glad to answer your question.

pregnant mothers all know that doctors will measure the pelvis before giving birth to a baby, but why and when? It is unclear to many pregnant mothers. Next, Jing Ma will talk about the relevant knowledge of "prenatal pelvic measurement". What is the purpose of prenatal pelvic measurement and when is it usually measured?

First of all, there are 2-3 pelvic measurements during pregnancy, which are divided into intra-pelvic measurements and extra-pelvic measurements.

Extrapelvic measurement is usually done at the 12th week of pregnancy, mainly to understand the size and shape of the pregnant mother's pelvis. Some pregnant women with large pelvis may also be able to do external tests directly with the naked eye when they meet experienced doctors.

pelvic internal measurement is an important factor to determine whether the fetus can give birth smoothly and naturally. Theoretically, it is measured at 24~36 weeks of pregnancy.

However, the specific examination time is different in different hospitals. Some hospitals may take the test once at the 28th week of pregnancy and once again at the 34th-37th week of pregnancy. However, some hospitals take the test at 35-37 weeks of pregnancy.

The main purpose is to accurately understand the fetal position, pelvic size, etc., and give advice to pregnant mothers on appropriate delivery methods.

PS: Why did you choose to have an internal test at 35-37 weeks of pregnancy?

many doctors will put the check-up time before the full term of the fetus, but after the full term of the fetus, it may be started and born at any time.

checking the pelvic size of pregnant mothers in advance can avoid many problems.

However, if you wait until the baby is born, it may be too late. For example, a pregnant mother who has broken water first has already lost part of her amniotic fluid. At this time, it is delaying the time and may increase the risk of infection.

If the pregnant mother decides to give birth naturally, the fetal head has already entered the pelvis, and even the delivery process has entered the second stage of labor, but the pelvic size has not been measured in advance, and no relevant assessment has been made. If the pregnant mother's pelvic condition is not suitable for a natural delivery, it will increase the chances of dystocia or other dangers.

Therefore, it is usually done in advance, but not too early. Exactly how many weeks of pregnancy is the check-up, just listen to the arrangement of the obstetrician. Because there will be pain during internal measurement, and the pain may cause contractions and even lead to premature delivery. Is it necessary to check the pelvis before delivery?

In fact, as long as we understand the relationship between pelvis and pregnant women's delivery, the answer to this question will be known. Let's talk about the connection between the two.

Let's talk about pelvis first. For those who have no medical knowledge, it is a somewhat academic word, and may not understand what it means.

However, if a woman has given birth, in the post-pregnancy check-up, she usually has a head position in the column of "fetal position" on the pregnancy check-up report, or she is told by the doctor that the fetus has entered the basin.

Then the term "head position" and "fetus entering the pelvis" here means that the head of the fetus enters the pelvic cavity, and the pelvis is a part of the birth canal, which means that the fetus is further prepared for birth, and the head position is a kind of fetal position conducive to natural delivery.

It can be seen from this pregnant woman's delivery process that "pelvic size" can determine whether the fetus can successfully pass through the birth canal and how fast it can pass through the birth canal.

Therefore, it is quite necessary for pregnant mothers who want to give birth naturally to have a pelvic examination for a period of time before delivery.

Write at the end:

Pelvic measurement is a normal pregnancy examination. According to the specific arrangements of the hospital, the doctor will inform the pregnant mother in advance what to check in the next delivery and what to pay attention to, mostly in the last stage of pregnancy, and measure the pelvis for a period of time before delivery to determine the delivery mode.

Pregnant mothers don't have to be too nervous. Just ask the doctor if you have any questions. I hope my answer can help you, and I wish you a smooth pregnancy!

There are many items of prenatal examination, and many pregnant mothers who are pregnant for the first time may feel dazzled. Some items even don't know what is going on, such as pelvic measurement, which is rarely mentioned in various pregnancy examination items, but it is a very important examination, because whether the fetus can deliver through the birth canal smoothly depends mainly on the situation of the birth canal. First, what is pelvic measurement for?

The birth canal includes the bone birth canal and the soft birth canal. The bone birth canal is the pelvis. If the fetus wants to give birth through the birth canal, it must first pass through the bone birth canal. Therefore, if the pelvis is abnormal or narrow, it is difficult for the fetus to pass. In order to reduce the unknown situation of pregnant mother during delivery and make delivery more smooth, pelvic measurement is usually carried out before delivery, and whether the fetus is suitable for natural delivery is judged according to the measured results. If it is not suitable for natural delivery, caesarean section will be carried out.

Pelvic measurement can be divided into extrapelvic measurement and intra-pelvic measurement. Extrapelvic measurement is relatively simple, just use special instruments to measure it outside. Pregnant mothers only need to cooperate according to the doctor's requirements, and there is no special requirement. Intrapelvic measurement requires doctors to check with their fingers in the vagina and measure various values with their fingers. There may be some soreness and swelling in pelvic measurement, which is a normal reaction. Pregnant mothers should not be too nervous. Being too nervous is more likely to feel pain, but it will be better to relax. If the pelvic shape is abnormal, it is necessary to do pelvic measurement before labor, and the results of internal examination should be used to judge whether the pregnant mother is suitable for natural delivery. Second, when do you usually measure the pelvis?

There is no regulation on when to measure pelvis. It depends on which hospital the pregnant mother is in and how the hospital arranges it. Some hospitals will carry out the first extrapelvic measurement when the file is filed at 12 weeks of pregnancy, and the second extrapelvic measurement will be carried out at about 37-38 weeks of pregnancy. Some hospitals will take the first extrapelvic measurement in about 34 weeks and the second measurement in 38 weeks. In short, there is no specified time.

The lazy mother took pelvic measurements twice when she gave birth to her baby, both before labor. Because lazy mother saw red first, she went to the hospital for a check-up after seeing red. It was during this check-up that the doctor took pelvic measurements, which had never been done before. Therefore, the difference between different places and hospitals is still far, but it is usually measured before delivery. Third, is pelvic stenosis unable to give birth naturally?

actually, it's not. Our pelvis has a certain curvature, and the narrowest place is only about ten centimeters, so the fetus needs to pass through this narrowest place before it can give birth smoothly. Moreover, the pelvis has more than this set of data. Even if the size and shape of the pelvis are not ideal, the fetuses are not all the same. Some fetuses are larger, and some fetuses are just right. If the pelvis is narrow and abnormal in shape, but the fetus is smaller, this will not affect the connection between the head and the pelvis, and the fetus can still give birth smoothly. On the contrary, even if the pelvic conditions are good, if the fetus is too big and the head and pelvis are not balanced, we can only make other plans.

Whether a pregnant mother can give birth smoothly is not only related to the pelvis, but also related to the size, position and productivity of the fetus. During pregnancy, it is best for the pregnant mother to have a checkup on time, so that some situations can be adjusted in time. For example, if the fetus is too big but not full-term, the pregnant mother can adjust her diet and exercise more at ordinary times to control the weight of the fetus. Other situations are the same, timely detection and timely treatment. What is the purpose of prenatal pelvic measurement and when is it usually measured?

Because the normal birth canal directly affects the delivery mode, in order to prevent dystocia caused by too narrow pelvis, in the third trimester, the doctor will aim at the mother to measure the pelvis. The time for pelvic measurement is between 28-34 weeks of pregnancy in most hospitals, and some hospitals need to do an appraisal at 37-38 weeks to judge whether the baby can give birth naturally.

How much does the pelvic size affect the delivery mode?

If the entrance is too small, the baby's head will enter the basin normally. If the outlet is too small, the fetal head can't be delivered smoothly, and the contractions are aggravated, the expectant mother's pain is unbearable, and the fetal head is deformed under pressure, which not only can't give birth normally, but also leads to the danger of intracranial hemorrhage and embarrassment of the baby for too long, and the expectant mother will have threatened uterine cleavage due to frequent contractions, which seriously affects the safety of the baby. When the pelvis is too small, the doctor will advise the expectant mother to have a cesarean section.

How to make pelvic measurements

Hospitals usually make extrapelvic measurements first. If the results of extrapelvic measurements are abnormal, they will make intra-pelvic measurements during labor, and choose the appropriate delivery mode according to the size, fetal position and productivity of the baby. How do expectant mothers cooperate with doctors to measure < P > If the doctor asks for a pelvic examination in the third trimester, don't refuse it for fear of the pain of gynecological examination. When cooperating with the doctor's examination, do deep breathing exercise and relax abdominal muscles at the same time. The more nervous the expectant mother is, the more difficult it is for the doctor to operate and the longer it takes.

In addition, with the growth of gestational age, the ligaments and muscles of expectant mothers will adapt to the enlargement of uterus and further relax in preparation for delivery. Therefore, some expectant mothers who find that their pelvis is not wide enough in the early stage may have their pelvis become normal when they are examined again in the third trimester. At this time, they can safely choose the natural delivery method.