Diagnosing Rett syndrome involves careful observation of your child's growth and development and answering questions about medical and family history. The diagnosis is usually considered when slowing of head growth is noticed or loss of skills or developmental milestones occurs.

For a diagnosis of Rett syndrome, other conditions with similar symptoms must be ruled out.

Evaluating other causes for the symptoms

Because Rett syndrome is rare, your child may have certain tests to determine whether other conditions are causing some of the same symptoms as Rett syndrome. Some of these conditions include:

  • Other genetic disorders
  • Autism spectrum disorder
  • Cerebral palsy
  • Hearing or vision problems
  • Metabolic disorders, such as phenylketonuria (PKU)
  • Disorders that cause the brain or body to break down (degenerative disorders)
  • Brain disorders caused by trauma or infection
  • Brain damage before birth (prenatal)

What tests your child needs depends on specific signs and symptoms. Tests may include:

  • Blood tests
  • Urine tests
  • Imaging tests such as magnetic resonance imaging (MRI) or computerized tomography (CT) scans
  • Hearing tests
  • Eye and vision exams
  • Brain activity tests (electroencephalograms, also called EEGs)

Core symptoms

Diagnosis of classic Rett syndrome includes these core symptoms, which may start to show up anytime from 6 to 18 months of age:

  • Partial or complete loss of purposeful hand skills
  • Partial or complete loss of spoken language
  • Walking problems, such as difficulty walking or not being able to walk
  • Repetitive purposeless hand movements, such as hand-wringing, squeezing, clapping or tapping, putting hands in the mouth, or washing and rubbing movements

Additional symptoms that typically occur with Rett syndrome can support the diagnosis.

Guidelines for diagnosis of atypical Rett syndrome may vary slightly, but the symptoms are the same, with varying degrees of severity.

Genetic testing

If your child's health care provider suspects Rett syndrome after evaluation, genetic testing (DNA analysis) may be needed to confirm the diagnosis. The test requires drawing a small amount of blood from a vein in your child's arm. The blood is then sent to a lab, where the DNA is examined for clues about the cause and severity of the disorder. Testing for changes in the MEPC2 gene confirms the diagnosis. Genetic counseling can help you understand gene changes and their effects.


Although there is no cure for Rett syndrome, treatments address symptoms and provide support. These may improve the potential for movement, communication and social participation. The need for treatment and support doesn't end as children become older — it's usually necessary throughout life. Treating Rett syndrome requires a team approach.

Treatments that can help children and adults with Rett syndrome include:

  • Regular medical care. Management of symptoms and health problems may require a multispecialty team. Regular monitoring of physical changes such as scoliosis, gastrointestinal (GI) issues and heart problems is needed.
  • Medications. Though medications can't cure Rett syndrome, they may help control some signs and symptoms that are part of the disorder. Medications may help with seizures, muscle stiffness, or problems with breathing, sleep, the gastrointestinal (GI) tract or the heart.
  • Physical therapy. Physical therapy and the use of braces or casts can help children who have scoliosis or require hand or joint support. In some cases, physical therapy can also help maintain movement, create a proper sitting position, and improve walking skills, balance and flexibility. Assistive devices such as a walker or wheelchair may be helpful.
  • Occupational therapy. Occupational therapy may improve purposeful use of the hands for activities such as dressing and feeding. If repetitive arm and hand movements are a problem, splints that restrict elbow or wrist motion may be helpful.
  • Speech-language therapy. Speech-language therapy can help improve a child's life by teaching nonverbal ways of communicating and helping with social interaction.
  • Nutritional support. Proper nutrition is extremely important for healthy growth and for improved mental, physical and social abilities. A high-calorie, well-balanced diet may be recommended. Feeding strategies to prevent choking or vomiting are important. Some children and adults may need to be fed through a tube placed directly into the stomach (gastrostomy).
  • Behavioral intervention. Practicing and developing good sleep habits may be helpful for sleep disturbances. Therapies may help improve problem behaviors.
  • Support services. Early intervention programs and school, social and job-training services may help with integration into school, work and social activities. Special adaptations may make participation possible.

Alternative medicine

A few examples of complementary therapies that have been tried in children with Rett syndrome include:

  • Music therapy
  • Massage therapy
  • Hydrotherapy, which involves swimming or moving in water
  • Animal-assisted therapy, such as therapeutic horseback riding
  • Adapted sports and recreational activities

Although there's relatively little evidence that these approaches are effective, they may offer opportunities for increased movement and social and recreational enrichment.

If you think alternative or complementary therapies might help your child, talk to your health care provider or therapist. Discuss the possible benefits and risks and how the approach might fit into the medical treatment plan.

Coping and support

Children and adults with Rett syndrome need help with most daily tasks, such as eating, walking and using the bathroom. This constant care and disturbed sleep can be exhausting and stressful for families and can impact the health and well-being of family members.

To better cope with the challenges:

  • Find ways to relieve stress. It's natural to feel overwhelmed at times. Talk about your problems with a trusted friend or family member to help relieve your stress. Take some time for yourself and do something that you enjoy so you can relax.
  • Arrange for outside help. If you care for your child at home, seek the help of outside caregivers who can give you a break from time to time. Or you may consider residential care at some point, especially when your child becomes an adult.
  • Connect with others. Getting to know other families facing problems similar to yours can help you feel less alone. Look for online support and information from organizations such as the International Rett Syndrome Foundation.

Preparing for your appointment

Your child's health care provider will look for developmental problems at regular checkups. If your child shows any signs or symptoms of Rett syndrome, you may be referred to a pediatric neurologist or developmental pediatrician for testing and diagnosis.

Here's some information to help you get ready for your child's appointment. If possible, bring a family member or friend with you. A trusted companion can help you remember information and provide emotional support.

What you can do

Before your appointment, make a list of:

  • Any unusual behavior or other signs. Your health care provider will examine your child carefully and check for slowed growth and development, but your daily observations are very important.
  • Any medications that your child takes. Include any vitamins, supplements, herbs and nonprescription medicines, and their dosages.
  • Questions to ask your child's health care provider. Be sure to ask questions when you don't understand something.

Questions to ask might include:

  • Why do you think my child does (or doesn't) have Rett syndrome?
  • Is there a way to confirm the diagnosis?
  • What are other possible causes of my child's symptoms?
  • If my child does have Rett syndrome, is there a way to tell how severe it is?
  • What changes can I expect to see in my child over time?
  • Can I take care of my child at home, or will I need to look for outside care or additional in-home support?
  • What kind of special therapies do children with Rett syndrome need?
  • How much and what kinds of regular medical care will my child need?
  • What kind of support is available to families of children with Rett syndrome?
  • How can I learn more about this disorder?
  • What are my chances of having other children with Rett syndrome?

What to expect from your doctor

Your health care provider may ask you questions such as:

  • When did you first notice your child's unusual behavior or other signs that something may be wrong?
  • What could your child do before that your child can no longer do?
  • How severe are your child's signs and symptoms? Are they getting progressively worse?
  • What, if anything, seems to improve your child's symptoms?
  • What, if anything, appears to worsen your child's symptoms?

Your health care provider will ask additional questions based on your responses and your child's symptoms and needs. Preparing and anticipating questions will help you make the most of your appointment time.

May 03, 2022

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  3. Rett syndrome. Eunice Kennedy Shriver National Institute of Child Health and Human Development. https://www.nichd.nih.gov/health/topics/factsheets/rett. Accessed Jan. 10, 2022.
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  6. Gold WA, et al. Rett syndrome: A genetic update and clinical review focusing on comorbidities. ACS Chemical Neuroscience. 2018; doi:10.1021/acschemneuro.7b00346.
  7. Ivy AS, et al. Rett syndrome: A timely review from recognition to current clinical approaches and clinical study updates. Seminars in Pediatric Neurology. 2021; doi:10.1016/j.spen.2021.100881.
  8. Fu C, et al. Consensus guidelines on managing Rett syndrome across the lifespan. BMJ Paediatrics Open. 2020; doi:10.1136/bmjpo-2020-000717.
  9. Rett syndrome: For families. International Rett Syndrome Foundation. https://www.rettsyndrome.org/for-families/. Accessed Jan. 10, 2022.
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