Dallaire L, Bélanger L, Smith C J, Kelleher P C
Br J Obstet Gynaecol. 1980 Oct;87(10):856-9. doi: 10.1111/j.1471-0528.1980.tb04436.x.
An elevation of alpha-fetoprotein concentration in maternal serum occurred in 7 of 65 patients (11 per cent) following amniocentesis. Analysis of the molecular heterogeneity of the alpha-fetoprotein by chromatography on concanavalin A-agarose indicated that the source of the alpha-fetoprotein was fetal serum in three patients and amniotic fluid in four patients.