CYP2D6*3x2 is assigned no function based on limited evidence. CYP2D6*3 is defined by a single nucleotide deletion causing a frameshift and resulting in a nonfunctional protein and is assigned no function (2211621). Therefore, consensus among experts was no function with an activity value of 0 based on limited evidence as it was determined the phenotypes containing a duplication of this allele would be clinically similar to phenotypes comprising the nonduplicated allele.