{{Rsnum
|rsid=7984966
|Gene=HTR2A
|Chromosome=13
|position=46855311
|Orientation=plus
|GMAF=0.2144
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|geno1=(C;C)
|geno2=(C;T)
|geno3=(T;T)
|Gene_s=HTR2A,HTR2A-AS1
}}{{ population diversity
| geno1=(C;C)
| geno2=(C;T)
| geno3=(T;T)
| CEU | 4.9 | 44.3 | 50.8
| HCB | 0.0 | 7.0 | 93.0
| JPT | 0.0 | 9.3 | 90.7
| YRI | 18.0 | 45.9 | 36.1
| ASW | 0.0 | 0.0 | 0.0
| CHB | 0.0 | 7.0 | 93.0
| CHD | 0.0 | 0.0 | 0.0
| GIH | 0.0 | 0.0 | 0.0
| LWK | 0.0 | 0.0 | 0.0
| MEX | 0.0 | 0.0 | 0.0
| MKK | 0.0 | 0.0 | 0.0
| TSI | 0.0 | 0.0 | 0.0
| HapMapRevision=28
}}Exploration of 19 serotoninergic candidate genes in adults and children with [[attention-deficit/hyperactivity disorder]] identifies association for [[5HT2A]], [[DDC]] and [[MAOB]]. C allele associated with [[ADHD]] in adults.

{{on chip | 23andMe v1}}
{{on chip | 23andMe v2}}
{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}
{{on chip | FTDNA2}}
{{on chip | FTDNA}}
{{on chip | HumanOmni1Quad}}