A method of genome-wide testing of gene copy number at the genetically most important loci to determine whether the gene and/or its selected larger surrounding chromosome region is rearranged to result in an unbalanced abnormality in one or more subjects, said method including selecting multiple gene loci of said DNAs to be examined in said test, conducting said test, and comparing the number of copies at each locus tested by quantification of total gene target number to determine the relative, number of each polymorphic sequence detected to assure that each important tested sequence is distinguished from the other alleles at the same locus. A method of detecting the highest number of abnormal patients possible based upon the number of test sites available in a protocol including selecting the most common genetic disease-causing mutations in a population by frequency, selecting and identifying the most common mutations in each by frequencies, multiplying the two frequencies together to get a frequency product which is the frequency of each mutation in the population, and ordering the frequency products beginning with the most common to prioritize which are the most common to detect the largest number of genetic abnormalities possible per test. Depending upon the stage of the life cycle, both of the methods can be done together or in sequence.