The main objective of this study is to estimate the intrinsic diagnostic qualities of the digital dPCR in the screening of T21 from a multicentrique sample of patients with pregnancies at high risk of T21 (risk \> 1/250). The profit expected from this technique is to propose to the encircled women a screening more successful than that of the screening combined(organized) of the 1st quarter, simple of realization and in a moderate cost. We thus propose here an original alternative(alternate) method to the exclusive, expensive and binding techniques of top-debit(-flow). The recent technical improvements and his(her,its) advantages medical - economic allow to envisage a reliable, strong and long-lasting use of the dPCR in clinical routine in the DPNI of T21 in most of the laboratories. This pilot project could serve for the later development of a study of clinical validation multicentrique of large scale(big turntable ladder).
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Intrinsic diagnostic qualities of the digital dPCR in the screening of T21 from a sample multicentrique of patients with pregnancies at high risk of T21 (risk > 1/250)
Timeframe: 24 months