{{Rsnum
|rsid=2878172
|Gene=GCH1
|Chromosome=14
|position=54906952
|Orientation=plus
|GMAF=0.4118
|Assembly=GRCh38
|GenomeBuild=38.1
|dbSNPBuild=141
|geno1=(A;A)
|geno2=(A;G)
|geno3=(G;G)
}}{{ population diversity
| geno1=(A;A)
| geno2=(A;G)
| geno3=(G;G)
| CEU | 28.3 | 42.5 | 29.2
| HCB | 67.2 | 29.2 | 3.6
| JPT | 62.8 | 31.9 | 5.3
| YRI | 6.2 | 39.0 | 54.8
| ASW | 12.5 | 42.9 | 44.6
| CHB | 67.2 | 29.2 | 3.6
| CHD | 72.5 | 23.9 | 3.7
| GIH | 35.6 | 44.6 | 19.8
| LWK | 10.9 | 40.9 | 48.2
| MEX | 43.1 | 51.7 | 5.2
| MKK | 16.8 | 47.1 | 36.1
| TSI | 46.1 | 40.2 | 13.7
| HapMapRevision=28
}}[http://ash.confex.com/ash/2009/webprogram/Paper22764.html A GCH1 Haplotype Associated with Susceptibility to Vasoocclusive Pain and Impaired Vascular Function in Sickle Cell Anemia]

{{PMID Auto
|PMID=17343757
|Title=Lack of influence of GTP cyclohydrolase gene (GCH1) variations on pain sensitivity in humans.
|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 | Illumina Human 1M}}