Kit, a Device and a Method for Detecting Copy Number of Fetal Chromosomes or Tumor Cell Chromosomes

摘要

The invention relates to a kit, a device and a method for detecting the copy number of fetal chromosomes and tumor cell chromosomes. The method for detecting the copy number of fetal chromosomes or tumor cell chromosomes of the invention includes the following steps: collecting maternal plasma or plasma of tumor patient; separating the plasma from blood cells in blood; preparing Deoxyribonucleic Acids (DNA) in the plasma into a sequencing library; sequencing the DNA sequencing library; comparing a sequencing result with a genomic sequence map to determine which chromosome the DNA sequence comes from and the length of each DNA sequence; and calculating the ratio of the DNA segments from the chromosomes to be detected to all DNA segments in the same sample by a sequencing and comparison result of DNA, correcting the ratio according to a GC content of the DNA segments from the chromosomes to be detected, and calculating the variation of the corrected ratio of the DNA segments from the chromosomes to be detected in a sample to be detected, and determining the copy number of the chromosomes to be detected according to degree of variation.