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First-trimester detection of amniotic sac in relation to miscarriage
1Ikegawa Clinic, Yokohama, Japan.
The Journal of Obstetrics and Gynaecology Research
|June 1, 1997
Summary
Early detection of the amniotic sac, especially when the crown-rump length (CRL) is less than 7 mm, can help predict miscarriage. This finding is crucial for first-trimester pregnancy risk assessment.
Area of Science:
- Obstetrics and Gynecology
- Early Pregnancy Ultrasound
- Reproductive Medicine
Background:
- Accurate prediction of first-trimester miscarriage is vital for clinical management.
- Ultrasound plays a key role in assessing early pregnancy viability.
- Amniotic sac detection is an important ultrasound marker.
Purpose of the Study:
- To determine the detection rate of the amniotic sac in early pregnancy.
- To evaluate if amniotic sac detection can predict miscarriage in the first trimester.
Main Methods:
- Comparative study involving 169 normal pregnancies and 169 miscarriage cases.
- All cases had a crown-rump length (CRL) under 40 mm.
- Analysis of amniotic sac detectability relative to CRL.
Main Results:
- Amniotic sac detectable in normal pregnancies at CRL ≥ 7 mm, with detection rates increasing with CRL.
- In miscarriage cases, amniotic sacs were detected at CRL < 7 mm, independent of CRL.
- Amniotic sac detection occurred in 38% of miscarriage cases (65/169).
Conclusions:
- Amniotic sac detection at CRL < 7 mm may indicate miscarriage.
- This sign is particularly useful when normal pregnancies do not yet show an amniotic sac.