Evaluation of a commercial immunoenzymometric assay for alpha-fetoprotein.

Abstract
A two-site immunoenzymometric assay (Abbott Diagnostics) for alpha-fetoprotein (AFP) in maternal serum and amniotic fluid has been evaluated for its suitability as a screening test for open neural tube defects. In a retrospective study based on 190 pregnancies of known outcome, performance of the kit in measuring both serum and amniotic fluid AFP correlated well with that of an in-house radioimmunoassay. Of 39 pregnancies associated with open neural tube defects, only four would not have been detected by the use of sequential measurement of serum and amniotic fluid AFP (also essentially in agreement with results obtained by the RIA). We conclude that this immunoassay could form the basis for a screening program for antenatal detection of open neural tube defects.

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