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Maternal alpha-fetoprotein screening: two years' experience in a low-risk district
British Medical Journal (Clinical Research Ed.)
|September 12, 1981
Summary
Maternal serum alpha-fetoprotein screening for neural tube defects showed poor predictive value, especially for non-anencephalic defects. This study questions the screening
Area of Science:
- Obstetrics and Gynecology
- Medical Screening
- Prenatal Diagnostics
Background:
- Neural tube defects (NTDs) are serious congenital abnormalities.
- Maternal serum alpha-fetoprotein (MSAFP) screening is used to detect NTDs.
- Accurate fetal maturity assessment is crucial in prenatal care.
Purpose of the Study:
- To evaluate the effectiveness of MSAFP screening for NTDs.
- To assess the utility of sonar scans for fetal maturity.
- To determine the predictive value of MSAFP in detecting open NTDs.
Main Methods:
- Screening of 3479 pregnant women over two years.
- Maternal serum alpha-fetoprotein estimation.
- Sonar scans for fetal maturity assessment.
- Amniocentesis for confirmation.
Main Results:
- Eight cases of open NTDs were identified.
- Anencephaly cases showed very high MSAFP values.
- Only one of four non-anencephalic NTDs was detected by MSAFP and confirmed.
- Two affected fetuses were missed by the screening.
Conclusions:
- MSAFP screening has poor predictive value for non-anencephalic open NTDs.
- Sonar scans for fetal maturity were accurate.
- The validity of MSAFP screening in low-incidence areas is questionable.