Question
Which hospital in Beijing is good for chromosome testing?
Answer
Chromosome Introduction: The abbreviations and symbols commonly used for normal and abnormal chromosomes (ISCN 1978) are as follows: A～G represent autosomes; 1～22 are the numbers of autosomes; XY are the sex chromosomes; / is used to separate different cell lines in a mosaic; + indicates an increase or loss of the entire chromosome when placed before the autosome number or group symbol; it indicates an increase or decrease in chromosome length when placed after the chromosome structure or other symbols; ? indicates a chromosome structure that is unclear or questionable and should be placed before the chromosome group or number; : represents a break; ∷ indicates a break and a connection; ; separates chromosomes and chromosome segments from several structural rearrangements; → indicates a change from … to …; ace is a telomeric fragment; cen is the centromere; chi is an allogeneic mosaicism; ct is a chromatid; del is a deletion; der is a derivative chromosome; dic is a duplicated centromere; dup is a duplication; ed is an internal duplication; g is a gap; h is a secondary constriction; i is an isochromosome; is is an insertion; iv is an inversion; ivis is an inversion insertion; iv(p-q+)/iv(p+q-) are interstitial inversions; mar is a marker chromosome; mat is maternal origin; mos is a mosaicism (homologous); P is the short arm of a chromosome; pat is paternal origin; Ph’ is the Philadelphia chromosome; q is the long arm of a chromosome; r is a ring chromosome; rcp is reciprocal translocation; rea is a rearrangement; rec is a recombinant chromosome; rob is a Robertsonian translocation; s is a supernumerary marker chromosome; sce is sister chromatid exchange; t is a translocation; ta indicates continuity (serial) translocation; ter is the terminus; pter is the short arm terminus; qter is the long arm terminus; tri is trisomy.