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The table below shows the percentages of X- and Y-bearing spermatozoa in semen samples from 50 different men (participants).

Individualparticipant | Y Sperm % | X sperm % | Individualparticipant | Y Sperm % | X sperm % |

1 | 56 | 44 | 26 | 48 | 52 |

2 | 63 | 37 | 27 | 43 | 57 |

3 | 37 | 63 | 28 | 48 | 52 |

4 | 37 | 63 | 29 | 43 | 57 |

5 | 45 | 55 | 30 | 53 | 47 |

6 | 39 | 61 | 31 | 33 | 67 |

7 | 41 | 59 | 32 | 48 | 52 |

8 | 48 | 52 | 33 | 40 | 60 |

9 | 34 | 66 | 34 | 41 | 59 |

10 | 55 | 45 | 35 | 43 | 57 |

11 | 48 | 52 | 36 | 49 | 51 |

12 | 59 | 41 | 37 | 22 | 78 |

13 | 44 | 56 | 38 | 31 | 69 |

14 | 52 | 48 | 39 | 45 | 55 |

15 | 59 | 41 | 40 | 57 | 43 |

16 | 48 | 52 | 41 | 48 | 52 |

17 | 48 | 52 | 42 | 44 | 56 |

18 | 49 | 51 | 43 | 40 | 60 |

19 | 50 | 50 | 44 | 30 | 70 |

20 | 49 | 51 | 45 | 44 | 56 |

21 | 51 | 49 | 46 | 44 | 56 |

22 | 51 | 49 | 47 | 43 | 57 |

23 | 51 | 49 | 48 | 36 | 64 |

24 | 52 | 48 | 49 | 46 | 54 |

25 | 50 | 50 | 50 | 46 | 54 |

The table above shows **the high degree of variation that exists between 50 individuals when it comes to X-to-Y sperm ratios**. For example, when comparing results for participant 2 (63% Y, 37% X) and participant 44 (30% Y, 70% X), it is clear that participant 2 would be expected to have a much higher probability of producing male (Y) children than participant 44, because participant 2 has 63% Y-bearing sperm in his semen vs. 30% in participant 44. Likewise, participant 44 would be expected to have a much higher probability of producing female (X) children.

But do these ratios hold true from ejaculate to ejaculate?

Research indicates that a given individualâ€™s X-to-Y sperm ratio remains consistent from sample to sample: it appears to be set at the genetic level. Therefore, although the number of spermatozoa and their motility may vary from ejaculate to ejaculate, **the ratio of X sperm to Y sperm remains constant for each individual**.

There is therefore great value for prospective parents in understanding your own personal X-to-Y sperm ratios. The SpermGenderCheck can provide you with the ratio of X-to-Y sperm in your semen sample, helping you to better anticipate the outcome and/or likelihood of success of any gender selection process you may be considering.

**Reference:**

- Jeyendran RS, Graham J, Tharma S, Ivanovic M, Levrant S, Ozornek HM, Fiddler MB. Individual variation of the percentage of Y-chromosome bearing sperm content in human ejaculates. Syst Biol Reprod Med. 2021; 67:5, 395-398