To collect samples for the purpose of developing and optimizing an in vitro noninvasive prenatal diagnostic (NIPD) test. The NIPD test employs circulating cell free (ccff) DNA extracted from whole blood samples collected from women who are pregnant with a fetus previously determined to have a chromosomal abnormality. The NIPD result will be compared to the standard test results obtained from other test methods such as karyotype, FISH, QF-PCR, and/or any commercially available NIPD test.

Inclusion Criteria:

• Subject is female
• Subject is 18 years or older
• Subject is no less than 8 and no more than 36 weeks gestation
• Subject provides a signed and dated informed consent
• Subject agrees to provide one or more 30-50mL blood sample(s) in accordance with the protocol
• Subject has a current pregnancy in which the fetus is known to have chromosomal aneuploidy (e.g. T13, T18, T21)

Exclusion Criteria:

• Non-singleton pregnancy in which only one fetus is known to have a chromosomal aneuploidy

Pregnant women who have been definitively diagnosed by amniocentesis, CVS or QF/PCR as carrying a fetus with aneuploidy

Samples and data are used in research and development of a noninvasive prenatal test. However, sample data used in publications will be shared as per requirements of the journal.