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What is the B-ultrasound examination of the eight-month-old fetus?

2025-10-23 10:51:36 female

What is the B-ultrasound examination of the eight-month-old fetus?

The eighth month of pregnancy (about 32 weeks) is an important stage in the third trimester. At this time, the fetal development is close to maturity, and B-ultrasound examination has become a key method to evaluate the health of the fetus. The following is a compilation of hot topics and structured data on the eight-month fetal B-ultrasound examination in the past 10 days to help expectant parents fully understand the examination content.

1. Core examination items of eight-month B-ultrasound

What is the B-ultrasound examination of the eight-month-old fetus?

Check itemsnormal indicatorAbnormal risk warning
Fetal biparietal diameter (BPD)7.8-8.5cmToo big may indicate hydrocephalus, too small may indicate developmental delay.
Femoral length (FL)6.0-6.8cmIf the length is shorter than 5.5cm, abnormal bone development must be investigated.
Abdominal circumference (AC)27-31cmIf you are too small, you may be malnourished; if you are too large, you may be wary of gestational diabetes.
Amniotic Fluid Index (AFI)8-18cm≤5cm means oligohydramnios, ≥24cm means too much amniotic fluid
placental maturityLevel 0-ILevel III indicates premature placental maturation and requires intensive monitoring

2. Recent hot topics of concern

1.AI-assisted B-ultrasound diagnosis: Many hospitals are piloting artificial intelligence to analyze fetal facial features and identify deformities such as cleft lips with an accuracy of 92%.

2.New standard for umbilical cord blood flow monitoring: The latest research found that when the S/D ratio is >3.0, the risk of fetal hypoxia increases by 2.4 times.

3.Internet celebrity controversial topics: Social media platforms are spreading the word "Formula for fetal weight based on B-ultrasound". Medical experts remind that the error can reach ±15% and should be based on clinical measurements.

3. Inspection Precautions

PreparationsCheck durationspecial request
No need to fast20-40 minutesIt is recommended to wear separate clothing
Empty your bladder earlyDeformity screening takes longerThree-dimensional B-ultrasound requires an appointment

4. High-frequency question answering

1.Question: Is B-ultrasound radiation harmful to the fetus?
Answer: Ultrasound examination uses sound wave imaging, without ionizing radiation, and is safe for routine examinations.

2.Question: Why should we check the location of the placenta?
Answer: Placenta previa can be confirmed at 8 months, the incidence rate is about 0.5%, and a delivery plan needs to be made in advance.

3.Question: What should I do if the fetal position is incorrect?
Answer: The incidence of breech presentation after 32 weeks is 15%, which can be adjusted by knee-chest recumbent position, and some hospitals carry out external inversion surgery.

5. Expert advice

According to the latest guidelines from the Perinatal Medicine Branch of the Chinese Medical Association:
• It is recommended that all pregnant women complete a systematic B-ultrasound at 32-34 weeks
• Elderly pregnant women need additional umbilical artery blood flow monitoring
• If abnormalities are found, reexamination should be done every 2-4 weeks
• Comprehensive assessment combined with fetal heart rate monitoring is more accurate

Note: The data in this article are synthesized from the National Health Commission's "Technical Specifications for Maternal and Childbirth Health Care" and the 2023 clinical statistics report of tertiary hospitals. There may be individual differences in specific examination items. Please refer to the advice of the attending doctor.

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