{{Rsnum
|rsid=2224721
|Gene=HTR2A
|Chromosome=13
|position=46858019
|Orientation=minus
|GMAF=0.3154
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|geno1=(A;A)
|geno2=(A;C)
|geno3=(C;C)
|Gene_s=HTR2A
}}{{ population diversity
| geno1=(A;A)
| geno2=(A;C)
| geno3=(C;C)
| CEU | 4.8 | 45.2 | 50.0
| HCB | 6.7 | 40.0 | 53.3
| JPT | 11.4 | 59.1 | 29.5
| YRI | 21.0 | 53.2 | 25.8
| ASW | 0.0 | 0.0 | 0.0
| CHB | 6.7 | 40.0 | 53.3
| 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
}}
{{PMID Auto
|PMID=19584773
|Title=Association between the serotonin 2A receptor gene and [[bipolar affective disorder]] in an Australian cohort
}}
: "Haplotype association analysis suggests that the haplotype CCGCA (at SNPs [[rs3125]], [[rs6314]], [[rs1923886]], [[rs2224721]] and [[rs2770296]]) is protective against [[bipolar disorder]] (P = 0.021, odds ratio 0.63) and the rarer haplotype CCACG confers risk to the disorder (P = 0.0065, odds ratio 3.08)."

{{PMID|21172166|OA=1
}} Pharmacogenetics of antidepressant response.

{{PMID Auto
|PMID=23798967
|Title=No Effect of Serotoninergic Gene Variants on Response to Interpersonal Counseling and Antidepressants in Major Depression
|OA=1
}}

{{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}}