Aromatase Deficiency
What is Aromatase Deficiency?
Aromatase deficiency is a rare genetic condition that affects how your body produces estrogen. The aromatase enzyme normally converts testosterone and other androgens into estradiol, the main form of estrogen. When this enzyme does not work properly, estrogen levels drop very low while testosterone levels climb higher than normal.
This hormonal imbalance can affect sexual development, bone growth, and overall health. The condition is present from birth and affects both males and females differently. In females, it can cause delayed puberty and virilization, which means developing male characteristics. In males, it leads to tall stature, delayed bone maturation, and ongoing growth into adulthood.
Because aromatase deficiency is genetic, it runs in families. Early detection through blood testing helps identify the condition before serious complications develop. Understanding your hormone levels is the first step toward managing this condition effectively.
Symptoms
- Delayed or absent puberty in females
- Unusually tall height compared to family members
- Continued growth past typical adult age
- Delayed bone maturation and open growth plates
- Virilization in females, including deepened voice and excess body hair
- Enlarged ovaries with multiple cysts in females
- Low bone density and increased fracture risk
- Infertility or difficulty conceiving
- Lack of breast development in females
- Insulin resistance and metabolic changes
Some people with mild aromatase deficiency may not notice symptoms until adolescence or adulthood. Others experience clear signs of hormonal imbalance during childhood.
Concerned about Aromatase Deficiency? Check your levels.
Screen for 1,200+ health conditions
Causes and risk factors
Aromatase deficiency is caused by mutations in the CYP19A1 gene. This gene provides instructions for making the aromatase enzyme. When mutations occur, the enzyme cannot properly convert androgens into estrogen. The condition follows an autosomal recessive pattern, meaning a person must inherit two copies of the mutated gene, one from each parent.
Risk factors include having parents who carry the gene mutation and having a family history of the condition. The mutations happen by chance during reproduction. Consanguineous marriages, where partners are related by blood, slightly increase the risk because both partners may carry the same rare mutation. There are no lifestyle or environmental factors that cause aromatase deficiency, as it is entirely genetic.
How it's diagnosed
Aromatase deficiency is diagnosed through blood tests that measure hormone levels. Estradiol testing is essential for identifying this condition. People with aromatase deficiency show very low or undetectable estradiol levels. At the same time, testosterone and androstenedione levels appear elevated. This specific pattern of hormone imbalance points to problems with the aromatase enzyme.
Rite Aid offers estradiol testing through our preventive health panel at Quest Diagnostics locations nationwide. Genetic testing can confirm the diagnosis by identifying mutations in the CYP19A1 gene. Your doctor may also order imaging studies to check bone age and evaluate bone density. Starting with hormone testing helps identify whether further specialized testing is needed.
Treatment options
- Estrogen replacement therapy to restore normal estradiol levels
- Regular monitoring of hormone levels through blood testing
- Bone density screening to prevent osteoporosis and fractures
- Calcium and vitamin D supplementation for bone health
- Weight-bearing exercise to strengthen bones
- Metabolic monitoring for insulin resistance and diabetes risk
- Fertility treatments when pregnancy is desired
- Working with an endocrinologist experienced in rare hormone disorders
- Genetic counseling for family planning decisions
Concerned about Aromatase Deficiency? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Aromatase deficiency is a rare genetic condition where your body cannot properly convert testosterone into estrogen. The aromatase enzyme is missing or does not work correctly. This causes very low estrogen levels and high testosterone levels, affecting development and bone health.
In females, the first signs often include delayed puberty and lack of breast development. Unusual height compared to family members may appear during childhood. Males may continue growing past age 18 and show delayed bone maturation. Some people do not notice symptoms until attempting to conceive.
Diagnosis starts with blood tests measuring estradiol, testosterone, and androstenedione levels. Very low estradiol with high testosterone suggests aromatase deficiency. Genetic testing confirms the diagnosis by finding mutations in the CYP19A1 gene. Bone age x-rays help assess skeletal maturity.
Yes, blood tests are the primary way to detect aromatase deficiency. Estradiol testing reveals very low or undetectable levels of this hormone. Testosterone and androstenedione levels appear higher than normal. This specific hormone pattern indicates a problem with the aromatase enzyme.
Yes, aromatase deficiency is inherited through an autosomal recessive pattern. You need two copies of the mutated CYP19A1 gene to develop the condition. Parents who carry one copy typically have no symptoms but can pass the mutation to their children.
The main treatment is estrogen replacement therapy to restore normal hormone levels. Regular blood testing monitors hormone levels and treatment effectiveness. Bone health requires calcium, vitamin D, and weight-bearing exercise. An endocrinologist manages treatment and watches for complications.
Fertility is often impaired but pregnancy may be possible with treatment. Estrogen replacement and other fertility treatments can help some people conceive. Working with a reproductive endocrinologist provides the best chance for pregnancy. Genetic counseling helps families understand inheritance risks.
Yes, low estrogen levels significantly affect bone health at any age. Bones may not mature properly and growth plates stay open longer than normal. Osteoporosis risk increases dramatically without treatment. Regular bone density screening and estrogen replacement help protect your bones.
Testing frequency depends on whether you are on treatment and your age. People receiving estrogen replacement typically need blood tests every 3 to 6 months initially. Once stable, annual or biannual testing may be enough. Your doctor determines the right schedule based on your specific situation.
Lifestyle changes support overall health but cannot fix the underlying enzyme deficiency. Weight-bearing exercise strengthens bones and reduces fracture risk. A diet rich in calcium and vitamin D supports bone health. However, hormone replacement therapy remains essential for managing this genetic condition.