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Turner syndrome (TS) is a chromosome condition involving one X chromosome and complete or partial absence of the second sex chromosome, together with characteristic clinical findings. Mosaic and structural chromosome patterns can produce substantial variation. TS is usually diagnosed in people with a female phenotype, but chromosomes, reproductive anatomy, hormone production, sex assigned at birth, and gender identity are distinct; respectful care uses the person's words and describes the relevant anatomy or physiology precisely. The 2024 international clinical guideline is the current multidisciplinary standard.
Urgent and pregnancy-related safety
Sudden severe chest, back, neck, or abdominal pain, especially with shortness of breath, fainting, weakness, or a neurologic change, requires emergency assessment for aortic dissection or another cardiovascular emergency. Tell the emergency team about the Turner syndrome diagnosis and known aortic, valve, blood-pressure, or heart history.
New severe headache, chest symptoms, fainting, or markedly elevated blood pressure also warrants urgent review. Acute hearing loss, severe dizziness with neurologic signs, or an ill infant with poor feeding, breathing difficulty, or color change should not be attributed to TS without assessment.
Pregnancy can place additional stress on the aorta and cardiovascular system. Anyone with TS considering pregnancy needs specialist cardiovascular imaging and risk counseling before conception or fertility treatment, with a coordinated plan during pregnancy and after birth. Some cardiovascular findings make carrying a pregnancy unsafe; this is an individualized specialist decision, not one that can be made from the karyotype alone. See the ASRM committee opinion.
Quick reference
| Topic | Condition-specific guidance |
|---|---|
| Chromosomes | Complete or partial absence of the second sex chromosome, sometimes in only a proportion of cells |
| Diagnosis | Clinical findings plus chromosome analysis; prenatal screening is not diagnostic and requires confirmation |
| Core care | Lifelong cardiovascular and blood-pressure surveillance, with endocrine, hearing, metabolic, bone, renal, reproductive, and psychosocial care as indicated |
| Learning | Overall cognitive ability is often typical; some people have specific visual-spatial, mathematics, executive, motor, or social-cognition needs |
| Communication | Hearing and individual language or neurodevelopmental findings matter more than the diagnosis alone |
| AAC | Uncommon as a diagnosis-driven need; assess only when the person's functional communication calls for support |
Recognition and diagnosis
Possible presentations include fetal edema or cystic hygroma, congenital heart or kidney findings, swelling of the hands or feet in infancy, short stature, delayed or absent spontaneous puberty, menstrual differences, reduced fertility, hearing loss, or characteristic physical findings. Some mosaic presentations are subtle and diagnosed later.
Chromosome analysis is the first-line postnatal diagnostic test and should include enough cells to assess mosaicism. A prenatal cell-free DNA result is a screening result; diagnostic testing and appropriate postnatal confirmation are separate decisions. Genetics review can interpret mosaic or structural findings, determine whether additional testing for Y-chromosome material is relevant, and provide individualized counseling.
TS is not accurately described as a gene mutation, a condition confined to women, or a uniform monosomy. Surveillance guidance can also be clinically relevant to some people with X/XY mosaicism and male or ambiguous genital development, as specified in the international guideline.
Lifelong health care
Care should be coordinated across primary care, cardiology, endocrinology, genetics, audiology and otolaryngology, renal care, reproductive medicine or gynecology, psychology or neuropsychology, dentistry, and other services according to findings. Important areas include the aorta and congenital heart disease, blood pressure, growth, puberty and sex-hormone replacement, thyroid and metabolic health, liver health, celiac disease, bone health, renal anatomy, hearing, vision, dental care, and sleep.
Growth hormone, estrogen, progesterone, fertility preservation, and reproductive options are preference-sensitive specialist decisions. Information should be offered in developmentally appropriate and accessible language, without assuming that height, puberty, menstruation, fertility, pregnancy, or a particular gender expression defines the person's goals or identity.
Hearing, learning, and communication
Conductive and sensorineural hearing loss can occur and may be unrecognized without screening. Hearing access affects speech perception, language, learning, balance, social participation, and safety. Audiology and middle-ear care should follow the current guideline and the individual's findings.
Intellectual disability is not a defining feature of TS. Some people have relative verbal strengths alongside visual-spatial, mathematics, processing-speed, attention, executive, motor, or social-cognition difficulty; others do not. Assessment should target the reported functional concern and consider hearing, vision, anxiety, fatigue, school or work demands, and the person's own priorities. Supports may include explicit instruction, accessible diagrams, untimed practice, organizational tools, or social-communication help when individually indicated.
Speech-language therapy is based on a demonstrated speech, language, hearing-related, voice, or social-communication need. A routine diagnosis-based therapy schedule is not supported. Likewise, feeding or swallowing therapy is indicated from symptoms and assessment, not from TS alone.
AAC and access planning
Most people with TS communicate without AAC. AAC may be relevant for an individual with significant hearing, speech, language, motor, or co-occurring developmental needs, whether or not those needs are related to TS. It can supplement speech and should preserve the person's preferred language and communication forms.
Assessment should feature-match language, literacy, hearing, vision, motor access, cognition, fatigue, settings, and preferences. Text, sign, visual supports, communication boards, speech-generating technology, or adapted access are possibilities to evaluate rather than syndrome-based prescriptions. Include self-advocacy and health vocabulary, particularly for pain, cardiovascular symptoms, hearing access, medicines, consent, puberty, and reproductive care. See the AAC assessment and acquisition guide and ASHA AAC Practice Portal.
Transition and prognosis
Transition planning should transfer the karyotype report, cardiovascular images and risk category, blood-pressure history, endocrine and hormone plan, hearing profile, renal findings, medicines, and the person's priorities. Adult care remains multidisciplinary even when the person feels well.
Health and participation vary widely by chromosome pattern, congenital findings, cardiovascular and hearing health, treatment access, environment, and personal goals. Prognosis should be individualized rather than based on stature, fertility, mosaic status, or diagnosis alone.
Key sources
- European Journal of Endocrinology: 2024 international Turner syndrome guideline
- ESHRE: Turner syndrome guideline overview
- American Society for Reproductive Medicine: Cardiovascular risk and pregnancy in Turner syndrome
- American College of Cardiology and American Heart Association: Aortic Disease Guideline
- ASHA: Augmentative and Alternative Communication