Spina Bifida And Blood Groupings I Am Due To Have My Blood Test For Downs And Spina Bifida When I'm 17weeks, But I Am Away Until I Am 20weeks.

I am due to have my blood test for Downs and Spina Bifida when I'm 17weeks, but I am away until I am 20weeks. - spina bifida and blood groupings

Is it acceptable to have occurred testing, therefore, should disappear, or Search to return home for blood tests?