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Y DNA testing, also known as a Y chromosome test or Y-STR test, is used to help confirm whether individuals share a common paternal line. This test compares the Y chromosome profiles of men. A full match between profiles confirms that the men share a paternal line. If the males have different Y chromosome profiles then they do not share the same paternal line.

How does it work?

AlphaBiolabs uses the most up-to-date DNA testing technology to ensure the reliability and accuracy of its genetic testing. We use the latest 27 marker technology in our Y DNA testing. In addition, the low mutation rate of the Y chromosome makes this Y DNA test so reliable.

All male children inherit their Y chromosome from their father; these children will in turn pass the Y chromosome inherited from their father to their children when they become fathers. This inheritance pattern means that males coming from the same paternal line will always share the same Y chromosome. In other words, the Y chromosome of biological brothers, paternal uncles and male cousins will be identical. Male cousins could use the Y chromosome test to see if their fathers were brothers or to check if they shared a common grandfather or ancestor. In Immigration cases, a legal Y chromosome test can be used as proof of relationship.

Just for men?

The Y chromosome is only found in males. Females do not have Y chromosomes. However, although females cannot directly carry out a Y chromosome test, they can ask a male, paternal biological relative, to take the test on their behalf. This would be useful in the case of proving relationships to paternal cousins, for example, as cousin DNA testing is not as conclusive. A paternity, maternity or Aunt and Uncle test would also be better options.

Y DNA testing starts from just £199 for next day results. The test involves rubbing mouth swabs gently and painlessly on the inside of the cheek to collect cells. No blood is required for this DNA test.

Further details on AlphaBiolabs’ DNA testing services can be accessed at our Frequently Asked Questions page. Alternatively, please call our Customer Services team on 0333 600 1300; email or visit our website at