Sex, Gender, and DNA Testing in New Zealand: An Inclusive Guide

The words “sex” and “gender” are often used interchangeably, including on medical forms and identity documents. People are frequently required to nominate their sex or gender – often from a list that only includes “male” or “female.” For many, that choice is not straightforward.

The World Health Organisation (WHO) has emphasised that sex and gender are different concepts and should be recognised as such. This distinction matters in many areas of life, including DNA testing, particularly for people who are intersex, transgender, non-binary, or gender non-conforming.

Understanding the Difference Between Sex and Gender

• Sex
  WHO defines sex as categories based on biological and physical characteristics such as reproductive organs, chromosomes, and hormones. Sex is usually assigned at birth based on external genitalia. But this doesn’t always align with a person’s internal physiology or with how they identify as they grow.

  Some people are born with variations in sex characteristics that don’t fit typical definitions of male or female bodies. These variations are often described as intersex.

• Gender
  WHO defines gender as categories and identities shaped by social and cultural factors. Many people have a gender identity that matches the sex they were assigned at birth. But others may have gender identities that differ, for example, people who are transgender or non-binary.

  Gender identity may be expressed in many ways – through names, clothing, physical characteristics, behaviour, hormones, or surgery. However, none of these change a person’s underlying DNA or chromosomes.

Why Does This Matter in DNA Testing?

Humans have 23 pairs of chromosomes. One of these pairs are the sex chromosomes: typically XX or XY. These chromosomes usually determine whether a person develops body parts and reproductive organs traditionally considered female or male.

When a DNA test is performed, the resulting DNA profile will show whether a person has an XX, XY, or another chromosomal variation. Gender identity does not affect chromosomes or DNA.

For many people, their chromosomes align with their gender identity. But for others, they do not. For example:

• Someone may identify as male, but their DNA shows an XX chromosomal pair.

• Someone may identify as non-binary, but their DNA results show XY chromosomes.

• Some people may discover chromosomal variations consistent with intersex traits.

Inclusive DNA Testing at Identilab New Zealand

At Identilab, we treat all clients with respect, honesty, equality, and integrity. We recognise that DNA testing can be a sensitive experience, particularly for people who are transgender, non-binary, or gender diverse.

To avoid misgendering clients or producing results that may be misinterpreted, it’s important for us to have information on both a client’s sex assigned at birth and their gender identity. This ensures our scientists can interpret results correctly, while also respecting how clients identify.

We are committed to making the process as comfortable and supportive as possible. If you have concerns about testing and how your sex or gender identity may relate to results, please reach out – we are here to guide you through every step with care and understanding.

At Identilab, we provide respectful, confidential DNA testing for all clients, regardless of gender identity. We understand that DNA testing can raise sensitive questions, and we’re here to support you through the process with care and understanding.

Our DNA Testing Services:

• Paternity Testing in New Zealand – Confirm biological father
• Maternity Testing in New Zealand – Confirm biological mother
• Kinship Testing in New Zealand – Siblings, grandparents, and other relationships
• Twin Zygosity Testing in New Zealand – Identical or fraternal twins

Have Questions? We’re here to discuss your situation confidentially and help you understand how sex and gender relate to your specific testing needs.

• Call: +64 3 964 0659
• Email: hello@identilab.co.nz