How should I evaluate and manage a 40‑year‑old man with total testosterone 984 ng/dL (high‑normal) and estradiol 55 pg/mL (slightly elevated) while other hormones are normal?

No Treatment Indicated – This is Not Testosterone Deficiency

A 40-year-old man with total testosterone of 984 ng/dL (high-normal) and estradiol of 55 pg/mL (slightly elevated) with other normal hormones does not have testosterone deficiency and requires no testosterone therapy. This patient's testosterone level is well above the diagnostic threshold of <300 ng/dL required for testosterone deficiency 1.

Why This Patient Does Not Need Treatment

Testosterone Level Analysis

• Total testosterone of 984 ng/dL is in the upper-normal range – far exceeding the <300 ng/dL cutoff that defines low testosterone 1
• The AUA guidelines target testosterone levels of 450-600 ng/dL for men on therapy 1; this patient is already above that therapeutic goal
• Healthy men in their 40s have testosterone levels ranging from 251-914 ng/dL (2.5th-97.5th percentile) 2, placing this patient in the upper portion of normal

Estradiol Level Assessment

• Estradiol of 55 pg/mL is only mildly elevated but not pathologically high
• Healthy US men in their 40s have median estradiol levels of approximately 29-37 pg/mL 3, so 55 pg/mL represents modest elevation
• The testosterone-to-estradiol ratio is approximately 17.9 (984 ng/dL ÷ 55 pg/mL), which is above the normal 20th percentile threshold of 9.77-10 4, indicating appropriate aromatization balance

What to Evaluate

Since testosterone is not deficient, focus on why estradiol is mildly elevated:

Key History Points

• Exogenous testosterone or anabolic steroid use – most common cause of this hormone pattern (high testosterone with elevated estradiol from aromatization)
• Medications that increase aromatase activity or estrogen levels
• Alcohol consumption (>6 drinks/day associated with hormonal changes) 2
• Obesity or recent weight gain (adipose tissue aromatizes testosterone to estradiol)
• Liver disease (impaired estrogen metabolism)

Physical Examination

• Check for gynecomastia – breast tenderness, palpable glandular tissue 5
• Signs of exogenous androgen use (acne, testicular atrophy)
• Stigmata of liver disease
• Body habitus and BMI (obesity increases aromatization)

Additional Testing if Indicated

• If gynecomastia or breast symptoms are present: Testicular ultrasound to exclude testicular tumors (which can produce estrogen) 5
• Liver function tests if clinical suspicion of hepatic dysfunction
• Consider repeating hormones if exogenous testosterone use is suspected and patient denies use

Management Approach

If No Exogenous Testosterone Use

• Reassurance – these levels do not require intervention
• Address modifiable factors: weight loss if obese, reduce alcohol if excessive
• No role for aromatase inhibitors in asymptomatic men with normal testosterone 1, 5
• Aromatase inhibitors are reserved for men with testosterone deficiency who desire fertility preservation 1, not for men with normal-to-high testosterone

If Exogenous Testosterone Use is Confirmed

• Counsel on risks: Exogenous testosterone suppresses spermatogenesis and can cause infertility 1
• If fertility is desired, discontinue exogenous testosterone immediately
• Monitor for testicular atrophy and consider fertility evaluation if conception is a goal

If Symptomatic Gynecomastia

• Watchful waiting is first-line after addressing underlying causes 5
• Surgical referral only for persistent, bothersome gynecomastia 5
• Do not use SERMs or aromatase inhibitors for gynecomastia treatment in general practice 5

Critical Pitfalls to Avoid

1. Do not prescribe testosterone therapy – this patient has no indication (testosterone >300 ng/dL) and would risk polycythemia, cardiovascular events, and infertility 1
2. Do not empirically start aromatase inhibitors – inappropriate without confirmed testosterone deficiency and fertility concerns 1
3. Do not ignore potential exogenous testosterone use – this hormone pattern is classic for undisclosed anabolic steroid use
4. Do not over-investigate mild estradiol elevation in the absence of symptoms or concerning physical findings