自1976 Yunis等采用氨甲喋呤(MTX)同步培养淋巴细胞方法,成功地制备出入的有丝分裂早期染色体显带标本以来,国内外学者在这方面提出了不同的制备方法,高分辨染色的G显带技术已达到了较高的水平。由于高分辨染色体提供了丰富精细的带型,在临床医学中可以发现已往不能发现的某些染色体微小易位、缺失等畸变。提高了染色体畸变的诊断率。我们应用Etheidium Bromide(简称EB)法 Since 1976 Yunis and other methotrexate (MTX) synchronized lymphocyte method, successfully prepared in and out of the mitotic early chromosomal banding specimens, the domestic and foreign scholars in this regard put forward different preparation methods, high-resolution staining G banding technique has been Reached a higher level. Due to the high resolution of chromosomes provide a rich and fine band type, in clinical medicine can be found in the past can not be found in some chromosomes minor translocation, deletion and other aberrations. Improve the diagnosis of chromosomal aberrations. We use Etheidium Bromide (referred to as EB) method