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