Estriol: estriol is an estrogen produced by both the fetus and the placenta
Screening tests do not look only at results from the blood test. They compare a number of different factors (including age, ethnicity, results from blood tests, etc...) and then estimate what a person’s chances are of having an abnormality in baby. This is a screening test, not a diagnostic test and the results will decide next steps if god forbid they are not favourable. But, deep breath, all will be fine! I guess we are just lucky in this day and age to have almost too much information!