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How accurate is a blood test for gender?

Casey Randall AlphaBiolabs

By Casey Randall, Head of Genetics at AlphaBiolabs
Last reviewed: 02/01/2024

In this article, we discuss baby gender testing, how the test works, and the accuracy of a baby gender test.

What is a blood test for gender?

A blood test for gender – also called a baby gender test or prenatal gender test – is a type of DNA test used to verify the gender of an unborn baby while they are still in the womb.

This type of test uses a blood sample from the mother (from 8 weeks into pregnancy), which can be used to determine whether any Y-chromosomal DNA is present.

If a Y chromosome is present, this indicates that the baby is a boy. If there is no Y chromosome present, the test indicates that baby is a girl.

How does a baby gender test work?

Every human being has a pair of sex chromosomes in each cell. The Y chromosome is present in males, who have one X and one Y chromosome, while females have two X chromosomes.

For a baby gender test, the mother’s blood sample is analysed by expert geneticists who look for the presence or absence of a Y chromosome within the mother’s blood.

If a Y chromosome is detected, this indicates that the baby is a boy. If no Y chromosome is detected, this indicates that the baby is a girl.

How accurate is a blood test for gender?

A blood test is the most accurate way of determining a baby’s gender before he or she is born.

Although ultrasound scans are commonly used to determine the gender of an unborn baby between weeks 19 and 20 of pregnancy, these scans are not always correct.

This is because if the ultrasound technician cannot get a clear view of the baby’s genitals, it may not be possible to confirm whether the baby is a boy or a girl.

The results of an AlphaBiolabs Baby Gender Test are quick, accurate and reliable.

We use state-of-the-art processes to identify whether DNA within the mother’s blood sample contains any Y-chromosomal DNA. If a Y chromosome is present, this is indicative of a male child. If a Y chromosome is not present, this is indicative of a female child.

For the highest chance of a conclusive result, the mother must be at least 8 weeks pregnant when providing a blood sample for testing. This is to ensure that any Y chromosome present is at a detectable level.

What samples are required for a blood test for gender?

An AlphaBiolabs Baby Gender Test requires a blood sample to be collected from the mother by an AlphaBiolabs clinician.

You can choose your preferred method of sample collection from the options below, when placing your order:

  • Arrange an appointment to have your sample collected at an AlphaBiolabs walk-in centre
  • Arrange an appointment for a professional AlphaBiolabs sample collector to visit you at an address of your choice

It is very important that the mother is at least 8 weeks pregnant when providing a blood sample for testing, for the highest chance of an accurate and conclusive result

Where can I buy a Baby Gender Test?

It’s easy to order your Baby Gender Test online now.

Simply place your order online and we will ship your test kit out to you in discreet, plain packaging, for full confidentiality.

The test requires a blood sample to be collected when the mother is at least 8 weeks pregnant. This is to ensure that any Y chromosome present is at a detectable level.

You can choose to have your blood sample collected at a convenient time and location of your choice.

Simply arrange for an AlphaBiolabs clinician to visit you at home or another location, or schedule an appointment at an AlphaBiolabs walk-in centre.

For confidential advice on whether this test is right for you, call our friendly and discreet Customer Services team on 0140 29466 or email info@alphabiolabs.ie

Order a baby gender test today

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Casey Randall AlphaBiolabs

Casey Randall

Head of Genetics at AlphaBiolabs

Casey joined the AlphaBiolabs team in 2012 and heads up the DNA laboratory.

An expert in DNA analysis and a member of the International Society for Forensic Genetics (ISFG), Casey holds an MSc with Distinction in DNA Profiling and a First-Class BSc with Honours in Forensic Science.

Casey is responsible for maintaining the highest quality testing standards, as well as looking for ways to further enhance the service that AlphaBiolabs provides and exploring new and innovative techniques in DNA analysis.