During pregnancy, pregnant women usually have high hopes for ultrasound examinations. However, any examination has its limitations. The results of the ultrasound examination may not be completely consistent with the actual situation, and pregnant mothers do not have to worry too much. Next, please follow the babyheartmonitor to understand the blind spots and limitations of ultrasound!

1. Check 4 blind spots

1. There is no 100% accuracy

Due to false positives and false negatives, no test can achieve 100% accuracy. Generally, ultrasound is about 60% to 70%, and the detection rate of high-level ultrasound for fetal organ abnormalities is about 80% to 90%.

2. Only detect structural problems

For example: Whether the fetus has abnormalities of the central nervous system (such as hydrocephalus, anencephaly), heart and lung, gastrointestinal system abnormalities, etc. If it is a small defect, it may be limited by the resolution of the ultrasound, making it difficult to detect.

3. Abnormalities are not necessarily unhealthy

Anomalies are divided into large anomalies and small anomalies. When the fetus has an abnormality, we have to consider whether the abnormality is enough to affect the decision of whether the fetus exists.

4. No one check can master all the conditions

Some problems can only be found in the middle and late stages of pregnancy, such as duodenal obstruction, which can only be found after six months of pregnancy. If the inspection is carried out earlier, it will naturally be impossible to grasp the existence of this problem.

2. Four restrictions in the inspection

1. Model

Different models have different functions. If you want to check the blood flow of the fetus, you must use doppler fetal monitor or color ultrasound.

2. Operating experience

When encountering a rare situation, whether the operator has enough experience to judge, and the experience must rely on the accumulation of the past.

3. Maternal status

Ultrasound is the echo of sound waves, presenting an image visible to the naked eye. If the fat layer of pregnant women is thick, it will affect the visibility.

4. Fetal condition

If there is oligohydramnios or the fetus has been lying down and punching during the examination, it is also difficult for the doctor to see the fetus’s gender, the number of fingers and other details.