Turner Syndrome
What is Turner Syndrome?
Turner syndrome is a genetic condition that affects only females. It occurs when one of the X chromosomes is missing or partially missing. Every cell in the body normally has two sex chromosomes, but girls with Turner syndrome are born with only one complete X chromosome.
This chromosomal difference affects development in specific ways. Most females with Turner syndrome are shorter than average and have ovaries that do not function properly. The ovaries may not develop fully or may stop working early. This leads to hormone imbalances that affect puberty, fertility, and overall health.
Turner syndrome happens randomly and is not passed down from parents. It affects about 1 in 2,000 to 2,500 female births. Early detection through blood testing can help girls and women get the right care. Hormone monitoring plays a key role in managing this condition throughout life.
Symptoms
- Short stature or slower growth than expected
- Webbed neck or broad chest
- Low hairline at the back of the neck
- Swelling of hands and feet, especially at birth
- Delayed or absent puberty
- No menstrual periods
- Infertility or difficulty getting pregnant
- Heart defects or kidney problems
- Learning difficulties with spatial concepts
- Hearing loss or frequent ear infections
Some girls are diagnosed at birth due to physical features. Others may not be diagnosed until puberty when periods do not start. Some women discover Turner syndrome only when trying to conceive. Early diagnosis helps with treatment planning and monitoring.
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Causes and risk factors
Turner syndrome is caused by a missing or incomplete X chromosome. This happens randomly during the formation of the egg or sperm, or very early in fetal development. It is not caused by anything parents did or did not do. The condition is not inherited, and women with Turner syndrome rarely pass it to their children.
Risk factors are not well understood because the condition occurs randomly. Maternal age does not appear to increase risk like it does with some other chromosomal conditions. The missing or altered X chromosome affects how the ovaries develop. This leads to early ovarian failure and low production of important hormones like estradiol. The body responds by producing high levels of follicle-stimulating hormone, or FSH, as it tries to stimulate the ovaries.
How it's diagnosed
Turner syndrome is diagnosed through chromosome testing called a karyotype. This test looks at the chromosomes in blood cells to check for missing or altered X chromosomes. Many cases are diagnosed during childhood when growth delays or physical features are noticed. Some cases are found during pregnancy through prenatal testing.
Blood hormone testing plays a key role in monitoring Turner syndrome. Girls and women with this condition often have elevated FSH levels and low estradiol levels due to ovarian dysfunction. Anti-Mullerian Hormone, or AMH, testing can also help assess ovarian reserve. Rite Aid offers testing for FSH, estradiol, and AMH through our flagship panel at Quest Diagnostics locations. Regular hormone monitoring helps doctors adjust treatment and track how the ovaries are functioning over time.
Treatment options
- Growth hormone therapy during childhood to increase final adult height
- Estrogen replacement therapy starting around age 11 to 12 to trigger puberty
- Progesterone therapy to protect the uterus and regulate menstrual cycles
- Regular heart and kidney monitoring to catch problems early
- Hearing tests and treatment for ear infections
- Calcium and vitamin D supplements to support bone health
- Thyroid function monitoring, as hypothyroidism is common
- Fertility counseling and assisted reproduction options when planning pregnancy
- Mental health support and educational interventions as needed
- Regular blood tests to monitor hormone levels and adjust treatment
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Frequently asked questions
Turner syndrome is a genetic condition that affects only females. It occurs when one X chromosome is missing or partially missing. The condition affects about 1 in 2,000 to 2,500 female births and happens randomly, not due to anything parents did.
Early signs include short stature, a webbed neck, and swelling of the hands and feet. Some babies are diagnosed at birth due to physical features. Other girls are diagnosed later when they do not enter puberty or start menstrual periods as expected.
Blood tests cannot diagnose Turner syndrome directly, but they can reveal hormone patterns that suggest the condition. Girls and women with Turner syndrome typically have high FSH levels and low estradiol levels. A chromosome test called a karyotype is needed to confirm the diagnosis.
The missing or altered X chromosome affects how the ovaries develop and function. When the ovaries do not work properly, the body produces more FSH to try to stimulate them. This creates a pattern of high FSH with low estradiol that can be detected through blood testing.
Most women with Turner syndrome are infertile due to ovarian dysfunction. However, some women have partial ovarian function and may be able to conceive naturally. Many women choose assisted reproduction methods like egg donation and in vitro fertilization to have children.
Treatment includes growth hormone therapy during childhood to increase height. Estrogen replacement therapy starts around age 11 or 12 to trigger puberty and maintain bone health. Regular monitoring of the heart, kidneys, thyroid, and hormone levels is essential throughout life.
Women with Turner syndrome need regular monitoring of FSH, estradiol, and AMH to track ovarian function. They also need thyroid function tests because thyroid problems are common. Glucose and lipid testing help monitor metabolic health, as diabetes and heart disease risks are higher.
Turner syndrome is genetic but not inherited. It occurs randomly during egg or sperm formation or early in fetal development. Parents do not pass it down to their daughters, and it does not run in families.
There is no way to prevent Turner syndrome because it happens randomly. Maternal age and family history do not increase the risk. The condition is not caused by environmental factors or anything parents can control.
Heart defects, kidney abnormalities, and hearing loss are common. Women with Turner syndrome have higher risks of high blood pressure, diabetes, and thyroid problems. Osteoporosis risk is elevated due to low estrogen levels if not treated properly with hormone replacement.