Long-term Monitoring & Adulthood

Growing up with 3β-HSD deficiency requires a shift from the intensive focus of a new diagnosis to a long-term “health maintenance” mindset. Because this condition is so rare, your care team will use a combination of specialized blood tests and physical monitoring to ensure your child reaches their full potential for growth and development ^[1][2].

Routine Monitoring Through the Years

As your child grows, their medication needs will change. Regular visits to a pediatric endocrinologist—typically every 3 to 6 months—are essential for tracking their progress ^[3].

• Growth and Bone Age: At every visit, the doctor will map your child’s growth velocity (how fast they are growing). If growth is too fast or too slow, they may order a bone age X-ray of the hand to see if the skeleton is maturing too quickly ^[4].
• Hormone “Fingerprinting”: Because 3β-HSD is unique, standard CAH tests aren’t enough. Doctors monitor the “Δ5” family of hormones, specifically 17-hydroxypregnenolone and DHEA-S, using a precise method called LC-MS/MS ^[1][5].
• Cardiovascular Health: Regular blood pressure checks and monitoring of renin levels help ensure that the salt-balancing (mineralocorticoid) medication is at the right dose ^[6][7].
• Bone Density: In late adolescence or adulthood, your doctor may recommend a DEXA scan to check bone strength, especially if your child required higher doses of steroids during childhood ^[8].

Special Considerations for Males: TARTs

A specific concern for boys with all types of CAH is the development of Testicular Adrenal Rest Tumors (TARTs) ^[9]. These are benign (non-cancerous) growths made of adrenal-like tissue that can develop inside the testes.

• Why They Matter: If TARTs grow large, they can press on the healthy parts of the testes, potentially leading to gonadal failure or difficulty with fertility in adulthood ^[10][9].
• Screening: Evidence for TARTs in 3β-HSD deficiency comes mostly from case reports. While screening schedules are individualized, testicular ultrasounds may be recommended starting in adolescence, or earlier if clinical symptoms, poor hormonal control, or specialist concern arise ^[11][12].
• Prevention: Consistent, stable hormone replacement therapy may help prevent or shrink TARTs, though it is not a guarantee. Irregular medication use has been linked to tumor enlargement ^[13][9].

Special Considerations for Females: Hyperandrogenism and Cycles

For girls, the “backlog” of Δ5 hormones can affect the ovaries and menstrual health as they enter their teen years ^[10].

• Puberty: Most girls with 3β-HSD deficiency enter puberty spontaneously and on time ^[10]. However, it is common to see premature pubarche (early pubic hair) before the start of actual puberty ^[5].
• PCOS-like Symptoms: The high levels of adrenal androgens can lead to hyperandrogenism and PCOS-like symptoms (Polycystic Ovary Syndrome-like features), involving irregular periods, acne, and ovarian changes ^[5][6]. Note that true PCOS is diagnosed using specific criteria after excluding CAH, but these symptoms warrant specialized evaluation.
• Monitoring: Adolescent girls should be monitored for regular menstrual cycles. If cycles are absent or highly irregular, additional hormone support may be needed ^[1][10].

Adulthood, Fertility, and Transition

Living with 3β-HSD deficiency does not mean a person cannot have a family. While fertility can be more complex, many individuals have successful outcomes with the help of specialized care ^[10]. As a patient transitions from pediatric to adult endocrinology, they must learn to manage their stress dosing, renew emergency kits, and prepare for adult reproductive health.

• For Men: Fertility may be possible but requires specialized counseling and care. TARTs and gonadal dysfunction can impact sperm production. Some men may choose to pursue semen cryopreservation (sperm banking) in early adulthood as a precaution if TARTs are present ^[14]. There are documented cases of men with this condition achieving paternity ^[10][9].
• For Women: Fertility may be possible, though it may require “fine-tuning” of medication to ensure regular ovulation ^[10][15]. Pregnant individuals with CAH require very careful stress dosing plans for labor and delivery ^[16].
• Genetic Counseling: Before starting a family, preconception genetic counseling is recommended to discuss carrier risks for partners ^[1].
• The Goal of Suppression: It is important to remember that the goal is not to “zero out” every hormone. In 3β-HSD, trying to force Δ5 hormones into a “normal” range with very high doses of steroids often leads to more side effects rather than better health outcomes ^[3].

Surveillance Summary Table