{{Rsnum
|rsid=17738966
|Gene=GCH1
|Chromosome=14
|position=54835501
|Orientation=plus
|GMAF=0.06657
|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 | 4.5 | 20.5 | 75.0
| HCB | 0.0 | 1.5 | 98.5
| JPT | 0.0 | 1.8 | 98.2
| YRI | 0.0 | 1.4 | 98.6
| ASW | 0.0 | 0.0 | 0.0
| CHB | 0.0 | 1.5 | 98.5
| CHD | 0.0 | 1.8 | 98.2
| GIH | 0.0 | 11.0 | 89.0
| LWK | 0.0 | 0.9 | 99.1
| MEX | 3.5 | 7.0 | 89.5
| MKK | 0.0 | 1.3 | 98.7
| TSI | 0.0 | 21.2 | 78.8
| 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]

{{on chip | 23andMe v1}}
{{on chip | 23andMe v2}}
{{on chip | 23andMe v3}}
{{on chip | 23andMe v4}}
{{on chip | Illumina Human 1M}}
{{on chip | NatGeo2}}