CAH may be diagnosed before a baby is born, during childhood or later in life.

Prenatal testing

Tests used to diagnose CAH in fetuses include:

  • Amniocentesis. This procedure involves using a needle to withdraw a sample of amniotic fluid from the womb and then examining the cells.
  • Chorionic villus sampling. This test involves withdrawing cells from the placenta for examination.
  • Maternal blood test. Because a mother's plasma contains DNA from her fetus, this test can determine the sex of a fetus and whether the fetus has CAH.

Newborns, infants and children

Doctors recommend that all newborns in the United States be screened for genetic 21-hydroxylase deficiency during the first few days of life. This test identifies the classic form of CAH but doesn't identify the nonclassic form.

Diagnosis of CAH in older children and young adults includes:

  • Physical exam. If the doctor suspects CAH based on a physical exam and symptoms, the next step is to confirm the diagnosis with blood and urine tests.
  • Blood and urine tests. These tests look for abnormal levels of hormones produced by the adrenal glands.
  • Gene testing. In older children and young adults, genetic testing may be needed to diagnose CAH.
  • Testing to determine a child's sex. In female infants who have severe ambiguous genitalia, tests can be done to analyze chromosomes to identify genetic sex. Also, pelvic ultrasound can be used to identify the presence of female reproductive structures such as the uterus and ovaries.


Your doctor will likely refer your child to a doctor who specializes in childhood hormonal issues (pediatric endocrinologist) for treatment of CAH. The health care team may also include other specialists, such as urologists, psychologists and geneticists.


The goal of treating CAH with medications is to reduce excess androgen production and replace deficient hormones. People who have the classic form of CAH can successfully manage the condition by taking hormone replacement medications throughout their lives. People who have nonclassic CAH may not require treatment or may need only small doses of corticosteroids.

Medications for CAH are taken on a daily basis. During periods of illness or significant stress, such as surgery, additional medications or higher doses may be needed.

Medications may include:

  • Corticosteroids to replace cortisol
  • Mineralocorticoids to replace aldosterone to help retain salt and get rid of excess potassium
  • Salt supplements to help retain salt

Monitoring the effectiveness of medication includes regularly scheduled:

  • Physical exams. The doctor will check your child's growth and development, including monitoring changes in height, weight, blood pressure and bone growth.
  • Monitoring for side effects. The doctor will monitor your child for side effects, such as the loss of bone mass and impaired growth, particularly if steroid-type replacement medication doses are high and used long term.
  • Blood tests to check hormone levels. It's critical to have regular blood tests to ensure hormone levels are balanced. A child who hasn't yet reached puberty needs enough cortisone to suppress androgens so that he or she can grow to a normal height. For females who have CAH, it's important to suppress androgens to minimize unwanted masculine characteristics. On the other hand, too much cortisone can cause Cushing syndrome.

Reconstructive surgery

In some female infants who have severe ambiguous genitalia as a result of classic CAH, doctors may recommend reconstructive surgery to improve genital function and make them look more feminine.

Surgery may involve reducing the size of the clitoris and reconstructing the vaginal opening. The surgery is typically performed between 2 and 6 months of age. Females who have reconstructive genital surgery may need more cosmetic surgery later in life.

Genital surgery is easier to perform when a child is very young. However, some parents choose to wait for surgery until their child is old enough to understand the risks and choose his or her own gender assignment.

Before making decisions about the best treatment approach for your child, talk with your doctor about these issues. Working together, you and your doctor can make informed choices that will help your child thrive.

Psychological support is important to the emotional health and social adjustment of female children who have genital abnormalities.

Prenatal treatment

Synthetic corticosteroids that cross the placenta to the fetus are controversial and considered experimental. More research is needed to determine the long-term safety and the effect of this treatment on fetal brain development.

Clinical trials

Explore Mayo Clinic studies testing new treatments, interventions and tests as a means to prevent, detect, treat or manage this condition.

Coping and support

Early and steady support from family and health care professionals can help your child have normal self-esteem and a satisfying social life. These approaches may help:

  • Include psychological counseling in your child's treatment plan as needed
  • Seek help from a mental health professional if you're having trouble coping and to help you develop healthy parenting strategies

Preparing for your appointment

You may start by seeing your family doctor or your child's pediatrician. He or she may refer you to a doctor who specializes in the diagnosis and treatment of conditions related to the adrenal glands (pediatric endocrinologist).

Here's some information to help you prepare for your appointment. Consider taking a family member or friend along for support and to help you remember information.

What you can do

To prepare for your appointment:

  • Find out if your child needs to follow any pre-appointment restrictions, such as changing food or liquid intake to get ready for blood and urine tests.
  • Make a list of any signs and symptoms your child has been experiencing, and for how long.
  • Make a list of your child's key medical information, including recent illnesses, any medical conditions, and the names and dosages of any medications, vitamins, herbs or other supplements.
  • Prepare questions you want to ask your doctor.

Some basic questions to ask your doctor may include:

  • What is likely causing my child's signs and symptoms?
  • Are there other possible causes for these symptoms?
  • What kinds of tests does my child need?
  • What treatment approach do you recommend?
  • What are the expected results of treatment?
  • What are the possible side effects of treatment?
  • How will you monitor my child's health over time?
  • What is my child's risk of long-term complications?
  • Do you recommend that my child receive psychological counseling?
  • Do you recommend that our family meet with a genetic counselor?

Don't hesitate to ask any other questions during your appointment.

What to expect from your doctor

Your doctor is likely to ask you a number of questions. Be ready to answer them to reserve time to go over points you want to focus on. For example, your doctor may ask:

  • What are your child's symptoms?
  • When did you first begin noticing these symptoms?
  • Has anyone in your family been diagnosed with congenital adrenal hyperplasia? If so, do you know how it was treated?
  • Are you planning to have more children?
March 03, 2020
  1. Congenital adrenal hyperplasia. National Organization for Rare Diseases. https://rarediseases.org/rare-diseases/congenital-adrenal-hyperplasia/. Accessed Dec. 29, 2019.
  2. Congenital adrenal hyperplasia. Genetic and Rare Diseases Information Center. https://rarediseases.info.nih.gov/diseases/1467/congenital-adrenal-hyperplasia. Accessed Dec. 29, 2019.
  3. Merke DP. Diagnosis of classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency in infants and children. https://www.uptodate.com/contents/search. Accessed Jan. 5, 2020.
  4. Nieman LK, et al. Genetics and clinical presentation of nonclassic (late-onset) congenital adrenal hyperplasia due to 21-hydroxylase deficiency. https://www.uptodate.com/contents/search. Accessed Jan. 5, 2020.
  5. Speiser PW, et al. Congenital adrenal hyperplasia due to steroid 21-hydroxylase deficiency: An Endocrine Society Clinical Practice Guideline. Journal of Clinical Endocrinology and Metabolism. 2018; doi:10.1210/mc2018-01865.
  6. Merke DP. Genetics and clinical presentation of classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency. https://www.uptodate.com/contents/search. Accessed Jan. 5, 2020.
  7. Simpson JL, et al. Prenatal genetic testing and treatment for congenital adrenal hyperplasia. Fertility and Sterility. 2019; doi:10.1016/j.fertnstert.2018.11.041.
  8. Lteif AN (expert opinion). Mayo Clinic. Jan. 5, 2020.


Associated Procedures

Products & Services