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Deficiency of testosterone biosynthesis — Clinical Guidelines

Overview

Testosterone biosynthesis deficiency, also known as hypogonadism, involves inadequate production of testosterone leading to various clinical manifestations including decreased libido, erectile dysfunction, fatigue, and reduced muscle mass. 2

Diagnosis

Clinical Symptoms: Definite signs and symptoms are essential for diagnosis.

Laboratory Testing: Measure low total testosterone levels in the morning using a reliable assay. 2

Comorbid Conditions: Evaluate for comorbidities that may influence testosterone levels or treatment eligibility. 1

Management

Testosterone Replacement Therapy (TRT): Recommended for symptomatic men with low testosterone levels to improve bone density, muscle mass, sexual function, and quality of life.

- Modalities: Intramuscular injections, gels, patches, buccal or oral formulations, and pellets. 2

Target Levels: Aim for serum testosterone levels in the mid-normal range during treatment. 2

Contraindications: Avoid TRT in patients with prostate or breast cancer, hyperviscosity, erythrocytosis, untreated obstructive sleep apnea, or severe heart failure. 2

Special Populations

Elderly Men: Increased prevalence due to natural decline in testosterone levels (~1% annually). Diagnosis and treatment should focus on symptomatic individuals only. 2

Comorbidities: Comprehensive evaluation and management of comorbidities are crucial, especially in older men lacking primary care access. 1

Key Recommendations

Diagnose testosterone deficiency only in symptomatic men with confirmed low morning testosterone levels (Evidence: Moderate 2).

Integrate primary care into the initial urological evaluation to improve management of comorbidities and overall outcomes (Evidence: Expert opinion 1).

Initiate testosterone replacement therapy selectively for symptomatic elderly men with low testosterone levels, avoiding those with specific contraindications (Evidence: Moderate 2).

References

1 Nguyen V, Berrios SE, Leonard A, Byrne ER, Patel DP, Martin L et al.. Integrated Urology and Primary Care Model Improves Outcomes for Men With Testosterone Deficiency. Urology practice 2023. link 2 Kazi M, Geraci SA, Koch CA. Considerations for the diagnosis and treatment of testosterone deficiency in elderly men. The American journal of medicine 2007. link 3 Zherdev AV, Byzova NA, Izumrudov VA, Dzantiev BB. Rapid polyelectrolyte-based immunofiltration technique for testosterone detection in serum samples. The Analyst 2003. link 4 Guldenaar SE, Pickering BT. Immunocytochemical evidence for the presence of oxytocin in rat testis. Cell and tissue research 1985. link

Deficiency of testosterone biosynthesis