Study of High Risk Non Invasive Prenatal Test Population
Study of High Risk Non Invasive Prenatal Test Population
The investigator want to study the population of high risk (over 1/50) of Trisomy 21.

 According to french guidelines, these patients needs to have a invasive test (such as
 amniocentesis) but some patients prefer to have a Non Invasive Prenatal Test, with a
 potential lack of information.
Inclusion Criteria:

 -  Prenatal screening of Trisomy 21 > 1/50 (high risk population)

 Exclusion Criteria:

 -  No exclusion criteria