Banding of chromosomal preparations was made with G bands, at a resolution level between 400 and 550 bands, according to the case, and cells from at least two independent cultures were analyzed, except for cases in which the fetal karyotype resulted to be a normal male, in which the analysis from just one T25 flask was enough.
Las preparaciones cromosómicas se bandearon con bandas G, a un nivel de resolución de entre 400 y 550 bandas, según el caso, y se analizaron células provenientes de al menos dos cultivos independientes, excepto en los casos en que el cariotipo fetal resultó ser masculino normal, en los cuales basta con el análisis de las células de un solo frasco T25.