Short answer · Medically reviewed summary · Last updated: 2026-05-08
Androgen Insensitivity Syndrome (AIS) is estimated to affect between 1 in 20,000 and 1 in 99,000 live births, though these figures are likely underestimates due to varying degrees of clinical presentation. This rare condition occurs when an individual with an XY karyotype is unable to respond to androgens, leading to a spectrum of physical traits that may not align with typical male development. What is the estimated prevalence of Androgen Insensitivity Syndrome? Determining the exact prevalence of Androgen Insensitivity Syndrome is challenging due to the wide clinical spectrum of the condition.
What is the prevalence of Androgen Insensitivity Syndrome?
Prevalence of Androgen Insensitivity Syndrome: how many people are affected worldwide, differences by sex and region, with sources.
Androgen Insensitivity Syndrome (AIS) is estimated to affect between 1 in 20,000 and 1 in 99,000 live births, though these figures are likely underestimates due to varying degrees of clinical presentation. This rare condition occurs when an individual with an XY karyotype is unable to respond to androgens, leading to a spectrum of physical traits that may not align with typical male development.
What is the estimated prevalence of Androgen Insensitivity Syndrome?
Determining the exact prevalence of Androgen Insensitivity Syndrome is challenging due to the wide clinical spectrum of the condition. Complete Androgen Insensitivity Syndrome (CAIS) is often cited at approximately 1 in 20,000 to 1 in 64,000 individuals, while Partial Androgen Insensitivity Syndrome (PAIS) is significantly harder to quantify. Because many individuals with milder forms may never receive a formal diagnosis, the true global prevalence of Androgen Insensitivity Syndrome remains unknown and likely higher than current clinical literature suggests.
How does Androgen Insensitivity Syndrome affect different populations?
Androgen Insensitivity Syndrome is an X-linked recessive condition that exclusively affects individuals with an XY chromosomal makeup. Because the condition results in a reduced or absent response to androgens, individuals with Androgen Insensitivity Syndrome present with a range of phenotypic expressions. Age of onset varies based on severity:
- Complete AIS: Often identified during investigation for primary amenorrhea in puberty or via inguinal hernia repairs in childhood.
- Partial AIS: May be identified at birth due to ambiguous genitalia, or later in life during fertility assessments.
Why is accurate data for Androgen Insensitivity Syndrome difficult to capture?
The rarity of Androgen Insensitivity Syndrome is compounded by significant diagnostic hurdles. Challenges include:
- Clinical Variability: The wide spectrum of physical presentations leads to frequent misdiagnosis or under-reporting.
- Diagnostic Delay: Many patients remain asymptomatic until puberty, delaying clinical identification.
- Lack of Universal Screening: There is no global newborn screening program for Androgen Insensitivity Syndrome, leading to reliance on symptomatic presentation.
At DiseaseMaps.org, we have seen 3 individuals join our community to share their personal experiences with Androgen Insensitivity Syndrome, highlighting the importance of patient-led registries in understanding this rare condition.
Next steps
- Consult with a pediatric endocrinologist or a clinical geneticist for formal diagnostic testing.
- Connect with the Androgen Insensitivity Syndrome community on DiseaseMaps.org to share lived experiences.
- Review resources from organizations like the AIS-DSD Support Group for specialized guidance.
Medical disclaimer: This information is for educational purposes only and does not constitute medical advice; please consult a qualified healthcare provider for personal health concerns.
References
- NIH Genetic and Rare Diseases Information Center (GARD)
- Orphanet: Portal for rare diseases and orphan drugs
- OMIM (Online Mendelian Inheritance in Man) database
- The AIS-DSD Support Group
