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妊娠特异性β_1糖蛋白(SP1)由胎盘的合胞体滋养层产生,在妊娠期间释放到母体血清中。SP1在羊水中的浓度为母体血清中的1/20～1/50。作者曾报道4例Meckel
Pregnancy-specific β 1 glycoprotein (SP1) is produced by the syncytiotrophoblast of the placenta and released into maternal serum during pregnancy. The concentration of SP1 in amniotic fluid is 1/20 to 1/50 of the maternal serum. The authors have reported 4 cases of Meckel