Reference ranges, optimal targets & how to interpret common result patterns.
Lab reports display reference ranges that are population averages — not necessarily what’s optimal for your health, performance and wellbeing. A result of 11 nmol/L total testosterone is technically ‘within the normal range’ — but for a symptomatic man in his 30s or 40s, most experienced clinicians would consider this suboptimal and worthy of further evaluation. Context matters: your symptoms, age, SHBG level and free testosterone should all be considered together.
Real-world interpretation scenarios — what the numbers suggest and what to do next
Check SHBG and calculated free T — functional deficiency can exist despite 'normal' total T - High SHBG reducing free testosterone
Rule out pituitary adenoma (check prolactin, MRI if prolactin elevated). Consider reversible causes: obesity, opioids, anabolic steroids - Secondary hypogonadism (central)
Rule out Klinefelter syndrome; assess fertility implications; TRT is appropriate but suppresses remaining sperm production - Primary hypogonadism (testicular failure)
Weight loss is the primary intervention; aromatase inhibitors considered in selected cases under specialist guidance - Excess aromatase activity (often obesity)
Investigate cause (medication, pituitary adenoma). Prolactin normalisation often restores testosterone without TRT - Hyperprolactinaemia suppressing HPG axis
Treat thyroid dysfunction first — testosterone often improves significantly once thyroid is optimised - Thyroid disorder suppressing testosterone
