this deviation from the usual test system protocol did not impair sensitivity ( 87 % ) , or specificity of the test on its own ( 95.6 % ) , or in combination with ultrasound examination of the fetus and alpha-fetoprotein and acetylcholinesterase testing of the amniotic fluid ( 99.9 % ) .
C0015965
fetus
C0002210
alpha-fetoprotein