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Early vaginal bleeding and first-trimester markers for Down syndrome
Pierangela De Biasio1, Silvana Canini, Angela Crovo
1UO di Ostetricia e Ginecologia, Istituto "G Gaslini", Università di Genova, Italy. bnhdeb@libero.it
Prenatal Diagnosis
|June 19, 2003
Summary
Early vaginal bleeding may slightly increase maternal serum free beta-hCG levels during Down syndrome screening. This finding is unlikely to significantly impact the overall false-positive rate of the screening test.
Area of Science:
- Prenatal diagnostics
- Maternal-fetal medicine
- Genetics
Background:
- First-trimester combined screening is crucial for detecting Down syndrome.
- Early vaginal bleeding is a common concern in early pregnancy.
- The impact of early vaginal bleeding on screening markers is not well understood.
Purpose of the Study:
- To evaluate the association between early vaginal bleeding and first-trimester Down syndrome screening markers.
- To determine if vaginal bleeding affects the accuracy of Down syndrome screening.
Main Methods:
- Retrospective analysis of 2330 singleton pregnancies undergoing first-trimester screening.
- Comparison of fetal nuchal translucency (NT), maternal serum PAPP-A, and free beta-hCG levels between pregnancies with and without early vaginal bleeding.
- Assessment of the false-positive rate of the screening test.
Main Results:
- A statistically significant increase in maternal serum free beta-hCG levels was observed in pregnancies with early vaginal bleeding (p=0.03).
- No significant differences were found in NT (p=0.07) or PAPP-A (p=0.40) levels.
- The false-positive rate did not differ significantly between the groups (p=0.33).
Conclusions:
- Early vaginal bleeding is associated with elevated maternal serum free beta-hCG levels in first-trimester Down syndrome screening.
- This elevation is unlikely to substantially alter the false-positive rate of the combined screening test.
- Further research may explore the clinical implications of this association.