< h1 class = "pgc-h-arrow-right" > gestational sac</h1>
The gestational sac is a primitive placental tissue, a small embryo wrapped in amniotic membranes and a network of blood vessels.
β-HCG> 1000 IU of vaginal ultrasound visible gestational sac
β-HCG>1800IU abdominal ultrasound can show the gestational sac, and fetal heartbeat can be seen after 2 weeks;
The gestational sac is about 4-12 mm in diameter at 5 weeks of pregnancy
The gestational sac is about 14-18 mm in diameter at 6 weeks of pregnancy
Before 9 weeks of pregnancy, the diameter of the gestational sac increases by about 1 mm per day, and the daily increase is < 0.6 mm is gestational sac dysplasia.
Formula: Gestational sac diameter: [(length + width) ÷2] Gestational sac diameter: [(length + width + thickness) ÷3]
< h1 class = "pgc-h-arrow-right" > yolk sac</h1>
After the embryonic fold, the yolk sac is clearly divided into the embryonic protothesis and the extraembryonic yolk sac, which contains a large number of yolks, and the wall of the yolk sac is formed by the extraembryonic endoderm and the extraembryoderm.
The average diameter of the gestational sac is 8-10 mm, and the yolk sac is visible in the vaginal ultrasound
The gestational sac diameter > 10 mm yin ultrasound did not see the yolk sac, indicating an empty gestational sac.
The average diameter of the gestational sac is > 18 mm, and the yolk sac is visible in the abdomen;
The yolk sac is 3-6 mm in diameter in the first trimester, and the size of the yolk sac varies with the gestational week, and at 10 weeks of pregnancy, the yolk sac reaches a maximum diameter of 5-6 mm.
A yolk sac > 6.1 mm suggests a developmental abnormality
The yolk sac diameter > 7 mm in diameter for suspected pregnancy failure
> 8 mm in diameter of the yolk sac indicates pregnancy failure
HCG greater than 7500 IU can be seen in yolk sacs. Large yolk sacs are associated with chromosomal abnormalities in embryos.
<h1 class= "pgc-h-arrow-right" > fetal heart, fetal bud</h1>
The diameter of the gestational sac is 14-18 mm (average > 16 mm) and the embryo should be seen by yin ultrasound
The diameter of the gestational sac is ≥ 18 mm without germ, and there is a possibility of embryo infertility;
The absence of embryonic dysplasia when the germ is not seen in the diameter of the gestational sac is 19-20 mm;
The absence of fetal buds in the diameter of the gestational sac ≥ 21 mm suggests that the embryo may stop breeding 8;
The diameter of the gestational sac ≥ 22 mm without germ, and the probability of embryos stopping breeding is extremely high;
The diameter of the gestational sac > 25 mm transabdominal ultrasound should see the germ, and the growth rate of the fetal bud is 1 mm per day.
The average gestational sac diameter mm = gestational age days - 30, germ length cm = gestational age days - 42 germ length cm = gestational age weeks - 6.5 (± 4 days), 6-12 weeks of pregnancy, gestational age prediction CRL is the most accurate.
Theoretically, if there is a fetal bud, there should be a fetal heart
No fetal heartbeat is seen when the length of the fetal bud is 2-4 mm, indicating that the embryo may be stopped;
When the length of the fetal bud ≥ 5 mm, no fetal heartbeat indicates embryo cessation.
Fetal heart
Theoretically, there should be a fetal heartbeat, and any size of the normal fetal bud should show fetal heartbeat beating; the fetal heartbeat should be shown when the fetal bud < 5mm should be checked by abdominal ultrasound.
When the fetal bud diameter is 1-4 mm and the fetal heart is seen, the serum β-HCG value is about 30000-50000IU/L;
If the HCG < 30,000 IU/L when the fetal heart rate is seen on the yin ultrasound examination, it indicates that the HCG rises slowly and there is a possibility of embryo infertility;
HCG>50000IU/L did not see a fetal heartbeat, suggesting that embryonic cessation is possible.
< h1 class= "pgc-h-arrow-right" > does not necessarily survive with fetal heartbeat buds</h1>
Relationship between gestational sac and germ and fetal heart:
The difference between the diameter of the gestational sac and the length of the fetal bud is about 14-18 mm
9 weeks' gestation does not indicate a possibility of embryonic dysplasia, such as a large gestational sac or a small gestational sac, before 9 weeks' gestation.
Large gestational sac
The difference between the diameter of the gestational sac and the length of the fetal bud ≥ 18 mm
19-21mm is a mild large gestational sac;
22-24mm is a moderately large gestational sac;
≥ 25 mm is a severely large gestational sac.
The difference between the diameter of the gestational sac and the length of the fetal bud is ≥ 22 mm, and the risk of embryo cessation is extremely high.
Some large gestational sacs develop uterine effusions 1-2 weeks after examination, and most large gestational sacs have a good prognosis after fetal preservation treatment.
Small gestational sacs
The difference between the diameter of the gestational sac and the length of the fetal bud ≤ 13 mm
10-13 mm is a mild small gestational sac
6-9 mm is a moderate small gestational sac
≤ 5 mm is a severe small gestational sac
≤ 10 mm, indicating that the embryo may be stopped
< 8 mm embryos are at greater risk of abortation
Most embryos < 5 mm are discontinued
< 3 mm embryos are sterilized.
Most small gestational sacs have uterine effusions or vaginal bleeding about 1-2 weeks after examination, and the success rate of small gestational sacs is significantly reduced.
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