Lipoid Congenital Adrenal Hyperplasia
What is Lipoid Congenital Adrenal Hyperplasia?
Lipoid congenital adrenal hyperplasia is a rare genetic disorder that affects the adrenal glands. The adrenal glands sit on top of your kidneys and produce hormones like cortisol and aldosterone. These hormones help regulate blood pressure, blood sugar, and how your body responds to stress.
In this condition, a protein called StAR does not work properly. StAR normally moves cholesterol into parts of your cells called mitochondria. Without working StAR protein, your body cannot make steroid hormones from cholesterol. This leads to a dangerous shortage of cortisol, aldosterone, and sex hormones.
Lipoid congenital adrenal hyperplasia is the most severe form of congenital adrenal hyperplasia. It usually appears in newborns within the first few weeks of life. Without early diagnosis and treatment, this condition can be life-threatening. However, with proper hormone replacement therapy, many people can manage their symptoms and live healthy lives.
Symptoms
- Severe dehydration and salt loss in newborns
- Vomiting and poor feeding in infants
- Low blood pressure that can lead to shock
- Darkening of the skin due to high ACTH levels
- Low blood sugar levels
- Weakness and fatigue
- Delayed puberty or absent sexual development
- Ambiguous genitalia in genetic males at birth
- Failure to thrive in infants
- Life-threatening adrenal crisis without treatment
Symptoms typically appear within the first few weeks of life. Most cases are diagnosed in newborns because of severe salt-wasting and adrenal crisis. Early detection is critical for survival and proper treatment.
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Causes and risk factors
Lipoid congenital adrenal hyperplasia is caused by mutations in the STAR gene. This gene provides instructions for making the StAR protein. When the gene is mutated, the StAR protein cannot transport cholesterol into mitochondria where steroid hormones are made. Without this transport system, the adrenal glands cannot produce cortisol, aldosterone, or sex hormones. The condition follows an autosomal recessive inheritance pattern, meaning both parents must carry one copy of the mutated gene for a child to develop the disorder.
Risk factors include having parents who are carriers of STAR gene mutations. Consanguinity, or marriage between close relatives, increases the risk of inheriting two copies of the mutated gene. Certain populations have higher carrier rates, though the condition remains extremely rare overall. Unlike some health conditions, lifestyle factors do not cause or prevent lipoid congenital adrenal hyperplasia because it is purely genetic.
How it's diagnosed
Lipoid congenital adrenal hyperplasia is diagnosed through blood tests that measure hormone levels. DHEA-Sulfate, or DHEA-S, is severely low or completely absent in people with this condition. This happens because the body cannot convert cholesterol into any steroid hormones. Doctors also measure cortisol, aldosterone, and other adrenal hormones, which are typically very low. Electrolyte levels like sodium and potassium are often abnormal. Genetic testing can confirm mutations in the STAR gene.
Rite Aid offers blood testing that includes DHEA-Sulfate screening as part of our flagship panel. This test can help identify hormone imbalances that may indicate adrenal disorders. Testing is available at over 2,000 Quest Diagnostics locations nationwide. Early detection through blood work is essential for starting life-saving hormone replacement therapy.
Treatment options
- Lifelong hormone replacement therapy with hydrocortisone to replace missing cortisol
- Fludrocortisone to replace missing aldosterone and maintain salt balance
- Salt supplementation, especially in infants and young children
- Sex hormone replacement during adolescence to support puberty and development
- Regular blood tests to monitor hormone levels and adjust medication doses
- Emergency injection training for adrenal crisis situations
- Increased medication doses during illness, injury, or stress
- Medical alert bracelet to inform emergency responders of adrenal insufficiency
- Regular follow-up with an endocrinologist who specializes in adrenal disorders
- Genetic counseling for families planning to have more children
Concerned about Lipoid Congenital Adrenal Hyperplasia? Get tested at Rite Aid.
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Frequently asked questions
Lipoid congenital adrenal hyperplasia is the most severe form of CAH because it affects the very first step of steroid hormone production. While other forms of CAH block specific hormone pathways, lipoid CAH prevents cholesterol from entering the mitochondria where all steroid hormones are made. This means the body cannot produce any cortisol, aldosterone, or sex hormones. The condition is also much rarer than other CAH forms and requires more intensive hormone replacement therapy.
Yes, newborn screening programs in some regions can detect severe adrenal insufficiency early. Blood tests showing very low or absent DHEA-S levels along with other hormone abnormalities can identify the condition before a life-threatening adrenal crisis occurs. Prenatal genetic testing is possible if both parents are known carriers of STAR gene mutations. Early diagnosis allows doctors to start hormone replacement immediately, which significantly improves outcomes.
People with lipoid congenital adrenal hyperplasia need frequent blood tests, especially during infancy and childhood. Initially, testing may occur every few weeks to ensure proper hormone replacement dosing. As the person grows and their condition stabilizes, testing typically happens every three to six months. Blood tests check DHEA-S, cortisol, aldosterone, electrolytes, and other markers. More frequent testing is needed during growth spurts, illness, or when adjusting medication doses.
An adrenal crisis is a life-threatening emergency that occurs when the body does not have enough cortisol. Symptoms include severe vomiting, diarrhea, dehydration, low blood pressure, confusion, and shock. People with lipoid CAH are at high risk because their bodies cannot produce cortisol naturally. Prevention includes taking all prescribed medications daily, increasing doses during stress or illness, and receiving emergency hydrocortisone injections when needed. Families should always have emergency medication available and know when to seek immediate medical care.
DHEA-S is extremely low or absent because the StAR protein cannot move cholesterol into mitochondria where hormone production begins. Cholesterol is the building block for all steroid hormones, including DHEA-S. Without cholesterol entering the mitochondria, no steroid hormones can be made at all. This makes severely low DHEA-S a key diagnostic marker for this condition, especially when combined with low cortisol and aldosterone.
Fertility in people with lipoid CAH depends on several factors, including the severity of the condition and how well it is managed. Genetic females typically have better preserved fertility than genetic males because ovarian function may be partially maintained with hormone replacement. However, pregnancy requires careful monitoring and medication adjustments. Genetic males often have severely impaired fertility due to lack of testicular development and sex hormone production. Consultation with an endocrinologist and fertility specialist is important for anyone considering pregnancy.
Stopping hormone replacement therapy in lipoid congenital adrenal hyperplasia is extremely dangerous and can be fatal. Without cortisol replacement, the body cannot respond to stress, regulate blood sugar, or maintain blood pressure. Without aldosterone replacement, dangerous electrolyte imbalances occur that can cause heart problems. An adrenal crisis can develop within hours to days of missing medications. Hormone replacement must continue for life and should never be stopped without medical supervision.
Most cases of lipoid congenital adrenal hyperplasia are severe and present in early infancy with life-threatening symptoms. However, some people have been diagnosed with milder or non-classic forms that appear later in childhood or adolescence. These cases may have some residual StAR protein function, allowing minimal hormone production. Even milder cases still require hormone replacement therapy and careful monitoring. The degree of severity often relates to the specific STAR gene mutations inherited.
Without proper treatment, lipoid congenital adrenal hyperplasia severely affects growth and development. Cortisol deficiency impairs growth, causes low blood sugar, and affects metabolism. Lack of sex hormones prevents normal puberty and sexual development. However, with early diagnosis and proper hormone replacement, most children can achieve normal growth patterns. Regular monitoring of height, weight, bone age, and development is important. Adjusting hormone doses as the child grows helps ensure proper physical and sexual maturation.
Genetic testing is highly recommended to confirm the diagnosis of lipoid congenital adrenal hyperplasia. While blood tests showing very low DHEA-S, cortisol, and aldosterone strongly suggest the condition, genetic testing identifies the specific STAR gene mutations. This confirmation helps guide treatment, provides information about disease severity, and allows for family planning counseling. Genetic testing can also identify whether siblings or future children are at risk of inheriting the condition.