Is a testosterone level of 129 nanograms per deciliter (ng/dL) within the normal range for an 18-year-old male?

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Last updated: June 27, 2025View editorial policy

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From the Research

A testosterone level of 129 ng/dL is below the normal range for an 18-year-old male. According to the most recent study 1, the normal testosterone range for young men aged 20-24 is between 409-558 ng/dL. Although this study does not specifically address 18-year-old males, it provides the most recent and relevant data on normal testosterone levels in young men.

Key Points to Consider

  • The study 1 suggests that age-specific normative values and cutoffs should be integrated into the evaluation of young men presenting with testosterone deficiency.
  • The individual's testosterone level of 129 ng/dL is significantly lower than the expected range for their age group.
  • Low testosterone in young men can affect development, muscle mass, bone density, mood, energy levels, and sexual function.

Recommended Course of Action

  • The individual should consult with a healthcare provider, preferably an endocrinologist, for further assessment and potential treatment.
  • The doctor will likely order additional blood tests to confirm the low testosterone level and investigate potential causes, which could include pituitary gland disorders, testicular issues, chronic illnesses, medications, or lifestyle factors.
  • Treatment options would depend on the underlying cause but might include testosterone replacement therapy in some cases.
  • It's essential not to self-diagnose or self-treat low testosterone, as proper medical evaluation is necessary to determine the appropriate course of action.

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

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