Table 3. Assignment of likely phenotypes (acetylation status) based on diplotypes of NAT2 alleles.

Likely phenotype	Genotype	Examples of diplotypes
Normal/high activity (rapid acetylator)	2 rapid NAT2 alleles (*4, *11, *12, *13, *18)	*4/*4, *4/*12, *4/*13, etc.
Intermediate activity (intermediate acetylator)	1 rapid NAT2 allele and 1 slow NAT2 allele	*4/*5, *4/*6, *5/*11, *7/*11, *13/*14, etc
Low activity (slow acetylator)	2 slow NAT2 alleles (*5, *6, *7, *14)	*6/*6, *7/*7, *6/*7, *5/*6, *5/*7, etc.