Is it accurate to do B-ultrasound in the afternoon

In fact, there is no specific time limit for B-ultrasound examination. It can be done at any time, and it is not necessarily more accurate to do it in the afternoon. If you want your test results to have smaller errors, people can choose to do the test on an empty stomach. After eating, there will be some deviations in your test results, especially for pregnant women, they must do the test on an empty stomach.

B-ultrasound is painless, harmless, and non-radioactive to the person being examined, so there is no need to worry.

1. When checking the heart, you should take off your shoes and lie flat on the examination bed after a short rest, unbutton your shirt, expose your chest and let the doctor check;

2. When probing deep organs that are easily disturbed by gastrointestinal gas, fasting examination or strict intestinal preparation is required. For example, if you want to detect the liver, gallbladder, and pancreas in the abdominal cavity, it is best not to eat milk, soy products, sugars, and other foods that are easy to ferment and produce gas for 3 days. Eat a light meal the night before the examination, and fast on the day of the examination.

3. If the patient needs to undergo gastrointestinal and biliary X-ray angiography at the same time, ultrasound examination should be performed before X-ray angiography, or 3 days after the above angiography;

4. When examining the uterus and its appendages, bladder, prostate and other organs in the pelvic cavity, you need to retain bladder urine before the examination. You can drink about 1000 ml of boiled water 2 hours before the examination. Do not urinate 2-4 hours before the examination.

In principle, B-ultrasound is ultrasonic transmission, which is just a kind of sound wave transmission, not ionizing radiation or electromagnetic radiation. This kind of sound wave does not cause any harm to human tissue. However, this does not mean that ultrasound examinations can be performed at will throughout the pregnancy without any restrictions on time and frequency. How many times ultrasounds are needed during pregnancy depends on the specific situation. Under normal circumstances, it is best for expectant mothers to have 3 ultrasounds during pregnancy, and no more than 5 times.

The first ultrasound examination should be done between 12 and 16 weeks of pregnancy: this can determine whether the pregnancy is single or multiple, and can also measure the size and development of the fetus.

The second B-ultrasound examination should be done between 20 and 25 weeks of pregnancy: An ultrasound examination in mid-pregnancy can help expectant mothers understand the growth and development of the fetus, and can also provide a further understanding of the fetal position and the amount of amniotic fluid. It can also detect fetal malformations at an early stage, such as fetal limb deformities, cleft lip and palate deformities, etc.

The third B-ultrasound examination should be done between 37 and 40 weeks of pregnancy: The B-ultrasound at this stage can help expectant mothers observe the fetal position, fetal size, degree of placental maturity, whether the umbilical cord is wrapped around the neck, etc., conduct a final assessment before delivery, and make various preparations before delivery, so this B-ultrasound is very important.