[Genetic analysis of carriers of complex chromosome rearrangement].

At present, the incidence of CCR is low. CCR carriers with normal phenotypes are often found because of reproductive problems, and their low chance of having a normal baby necessitates the use of preimplantation genetic test to improve the rate of live birth. Due to the diversity of the chromosomes and breakpoints involved in CCR, it is crucial to give each CCR carrier precise genetic counseling.