How to check for fetal implantation

Fetuses entering the pelvic cavity are usually confirmed through abdominal palpation or vaginal examination by obstetricians, and ultrasound examination can also assist in judgment. Entering the pelvic cavity refers to the fetal head entering the maternal pelvic entrance, which is a common process before delivery.

1. Obstetric abdominal palpation:

This is the most commonly used examination method. Doctors will touch the pregnant woman's abdomen with their hands and determine whether she has entered the womb by feeling the position, size, and range of motion of the fetal head. If the fetal head is fixed, has low mobility, and the lowest point of the fetal head is below the level of the pelvic entrance, it usually indicates that it has entered the pelvis. The doctor will also evaluate comprehensively based on the position of the fetal back and fetal heart auscultation. This inspection is non-invasive and convenient, and is a routine item of prenatal examination.

2. Vaginal examination:

The doctor performs a vaginal digital examination after disinfection, which can directly touch the bone part of the fetal head and evaluate its relationship with the pelvic ischial spine. If the lowest point of the fetal head reaches or exceeds the level of the ischial spine, that is, below the plane of the ischial spine, it is confirmed to have entered the pelvis. Vaginal examination can more accurately determine the degree of pelvic entry and fetal head position, but it is usually only performed before or during labor to reduce the risk of infection.

3. B-ultrasound examination:

B-ultrasound can visually display the relative position of the fetal head and pelvic entrance. Doctors measure the biparietal diameter and head circumference of the fetal head, and observe whether the fetal head is located behind the pubic symphysis of the mother, as well as the distribution of amniotic fluid, to assist in determining whether it has entered the pelvic cavity. B-ultrasound can also rule out problems such as head pelvic imbalance and abnormal fetal position, especially suitable for pregnant women with thick abdominal walls or difficult to touch fetal head position.

4. Self perception of pregnant women:

Pregnant women may feel some changes, such as smoother breathing and reduced stomach pressure (due to the descent of the uterine fundus), but frequent urination, lower back pain, or increased perineal pressure may occur. These feelings are indirect manifestations of fetal descent, but cannot be used as a diagnostic basis. Pregnant women should not rely solely on their own feelings to determine whether they have entered the womb. They still need to undergo professional examination and confirmation by a doctor.

5. Comprehensive evaluation:

Doctors will make a comprehensive judgment based on the pregnant woman's gestational age, parity, changes in uterine height, and the above examination results. For primiparous women, pelvic entry usually occurs 2-4 weeks before delivery; However, multiparous women may only enter the womb after delivery. If the examination finds that the fetus has not entered the pelvis, the doctor will evaluate whether there are factors such as head pelvic misalignment, abnormal fetal position, or umbilical cord entanglement, and develop follow-up management plans. Pregnant women should undergo regular prenatal check ups in the late stages of pregnancy, and a doctor should confirm whether the fetus has entered the womb through professional examination. Pay attention to daily physical changes, and seek medical attention promptly if there are signs of labor such as regular contractions, water breakthrough, or redness. Maintaining appropriate activities, such as walking, can help with fetal head descent, but avoid vigorous exercise. Pay attention to balanced nutrition in diet, control weight gain, and avoid the impact of fetal overgrowth on pregnancy. At the same time, maintain a positive mindset and prepare for childbirth.