Acetylcholinesterase/pseudocholinesterase ratio

Burton BK: Positive amniotic fluid acetylcholinesterase: distinguishing between open spina bifida and ventral wall defects. Am J Obstet Gynecol 1986; 155(5):984-986.

Wald NJ, Barlow RD, Cuckle HS, et al: Ratio of amniotic fluid acetylcholinesterase to pseudocholinesterase as an antenatal diagnostic test for exomphalos and gastroschisis. Br J Obstet Gynaecol 1984; 91(9):882-884.

Goldfine C, Miller WA, & Haddow JE: Amniotic fluid gel cholinesterase density ratios in fetal open defects of the neural tube and ventral wall. Br J Obstet Gynaecol 1983; 90(3):238-240.