2 HSCIC reformed into NHSD
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While this isn't necessarily suitable for a friendly social network styled website, the Health & Social Care Information CentreNHS Digital, anthe organisation responsible for providing IT services, software, etc. for healthcare in the UK, have some guidelines for gender values.

As far as UK healthcare systems are concerned, there must be 5 options, no more and no less, to cover everyone's different situations:

Male, Female, Other Specific, Not Known, Not Specified

While this isn't necessarily suitable for a friendly social network styled website, the Health & Social Care Information Centre, an organisation responsible for providing IT services, software, etc. for healthcare in the UK, have some guidelines for gender values.

As far as UK healthcare systems are concerned, there must be 5 options, no more and no less, to cover everyone's different situations:

Male, Female, Other Specific, Not Known, Not Specified

While this isn't necessarily suitable for a friendly social network styled website, NHS Digital, the organisation responsible for providing IT services, software, etc. for healthcare in the UK, have some guidelines for gender values.

As far as UK healthcare systems are concerned, there must be 5 options, no more and no less, to cover everyone's different situations:

Male, Female, Other Specific, Not Known, Not Specified

1
source | link

While this isn't necessarily suitable for a friendly social network styled website, the Health & Social Care Information Centre, an organisation responsible for providing IT services, software, etc. for healthcare in the UK, have some guidelines for gender values.

As far as UK healthcare systems are concerned, there must be 5 options, no more and no less, to cover everyone's different situations:

Male, Female, Other Specific, Not Known, Not Specified