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Cell-free NIPT result for chromosome X. The 1st axis represents the normalized level of X-chromosomal material and the 2nd axis represents level of Y-chromosomal material detected. The normal range for female euploid samples (Normal XX) and male euploid samples (Normal XY) are marked by the dotted lines. The cfNIPT result for the reported case is marked with an enlarged X. NCV, Normalized Chromosome Value (for chromosome X and chromosome Y, respectively).
