Introduction: Triple-X syndrome

Triple-X syndrome: A rare chromosomal genetic syndrome with one or more extra X chromosomes, leading to XXX (or more rarely XXXX or XXXXX), instead of the usual XX (female) or XY (male). These people are females as they have no Y male chromosome, but have an additional female X chromosome. Women can be largely unaffected, or may suffer from problems such as infertility (some but not all), and reduced mental acuity.

Statistics and Triple-X syndrome: Various sources and calculations are available in statistics about Triple-X syndrome, prevalence and incidence statistics for Triple-X syndrome, and you can also research other medical statistics in our statistics center.

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