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NAT2 phenotypes and genotypes
| Mutations | Allele designation | Phenotype |
| None | NAT2*4 (wild-type) | normal |
| T341C, C481T, A803G | NAT2*5B (r3,S1a) | Slow |
| C282T, G590A | NAT2*6A (M2) | Slow |
| T341C, C481T | NAT2*5A (M1) | Slow |
| T341C, CA803G | NAT2*5C (S1c) | Slow |
| C282T, G857A | NAT2*7B (M3) | Slow |
| C282T | NAT2*13 (S4) | |
| G590A | NAT2*6B (R2) | Unknown |
| G191A | NAT2*14A (M4) | Slow |
| A803G | NAT2*12A | Rapid |
