This study plans to evaluate the clinical performance of the MaterniT21 PLUS and/or GENOME Laboratory Developed Test, in the detection of fetal trisomy 21 in circulating cell-free DNA extracted from maternal blood samples obtained from women pregnant with a twin gestation.
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Determination of sensitivity of NIPT detection of trisomy 21 among a population of women with twin gestations.
Timeframe: time from maternal blood draw to delivery
Determination of specificity of NIPT detection of trisomy 21 among a population of women with twin gestations.
Timeframe: time from maternal blood draw to delivery