Abstract: The present invention relates to a method for genomic and/or genetic analysis of a human nucleic acid sample, the method comprising the steps of providing a group of human reference genomes; testing of the human nucleic acid sample for sex and/or ancestry; selecting one or more population-specific human reference genomes, PHREGs, from the group of human reference genomes on the basis on the results of the sex and/or ancestry test; and aligning the human nucleic acid sample to the selected PHREGs; and variant calling against the selected PHREGs. The present invention also provides respective computer systems and computer programs.