Is maternal alpha-fetoprotein screening still of value in a low-risk area for neural tube defects? |
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| Authors: | J G Hooker M Lucas B A Richards I M Shirley B D Thompson R H T Ward |
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| Institution: | 1. Department of Obstetries and Gynaecology, School of Medicine, University College Hospital, London, U.K.;2. Galton Laboratory, University College, London, U.K.;3. Department of Ultrasound, University College Hospital, London, U.K.;4. Department of Chemical Pathology, University College Hospital, London, U.K.
Deceased, 9 August, 1983.;5. Department of Obstetrics and Gynaecology, School of Medicine, University College Hospital, London, U.K. |
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| Abstract: | Estimation of maternal serum alpha-fetoprotein (AFP) was used as a screening method for the detection of neural tube defects (NTDs) in 6344 women over three years. Of 88 (1.4 per cent) who had one or more serum AFP levels equal to, or greater than, 2.5 multiples of the median (MoM) for the relevant gestational age, 43 (0.68 per cent) underwent amniocentesis. There were eight NTDs. Four of these were screened by serum AFP, and all cases of spina bifida had serum AFP levels greater than 3.0 MoM, including one small open defect which was not seen on ultrasound. The other four cases of NTD, which were not screened, were identified by ultrasound. Of 64 singleton pregnancies 32 (50 per cent) had serum AFP levels between 2.5 and 3.0 MoM, and low birthweight (?2500 g) occurred in 29 per cent. Because of improvements in ultrasound techniques and the apparent falling incidence of NTD, the role of serum AFP as the primary screening procedure should be regularly reviewed. Effective screening is dependent on mothers booking early. |
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| Keywords: | Maternal serum alpha-fetoprotein Prenatal screening Neural tube defects |
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