Mens Health · Supplementary · from Mens Health
Case 1: Testosterone Deficiency Syndrome
Patient Presentation
Demographics: 52-year-old male accountant
Chief Complaint: "I've lost my energy, my drive, and honestly my confidence over the past two years."
History of Present Illness: The patient presents with a progressive 2-year history of fatigue, decreased libido, erectile dysfunction, and depressed mood. He reports that his energy levels have significantly declined, with afternoon fatigue so severe that he struggles to remain productive at work. He has noticed a loss of motivation and enthusiasm for activities he previously enjoyed, including golf and woodworking.
His sexual complaints include decreased frequency of morning erections (from daily to 1-2 per week), reduced libido, and difficulty maintaining erections during intercourse. He estimates sexual activity has decreased from 2-3 times per week to 1-2 times per month, causing significant relationship strain with his wife.
He has gained approximately 15 kg over the past 3 years despite no major dietary changes, with fat accumulation primarily in the abdominal region. He has noticed decreased muscle mass in his arms and legs and reports that his strength at the gym has plateaued and declined despite consistent training. He also reports increased irritability, difficulty concentrating, and occasional hot flashes.
Past Medical History:
- Obstructive sleep apnea (diagnosed 3 years ago, non-compliant with CPAP)
- Type 2 diabetes mellitus (diagnosed 1 year ago)
- Dyslipidemia
- Obesity (BMI 33.2)
Medications:
- Metformin 1000 mg BID
- Atorvastatin 20 mg daily
- CPAP prescribed but not using
Social History:
- Non-smoker, 2-3 beers on weeknights, more on weekends (estimated 18-20 units/week)
- Sedentary job, attempts gym 2x/week
- Married for 25 years, relationship strain
- Reports high work stress during tax season
Family History:
- Father: Type 2 diabetes, myocardial infarction at age 62
- Mother: Osteoporosis
- Brother: Diagnosed with low testosterone at age 48
Physical Examination
- Vital Signs: BP 142/88 mmHg, HR 74 bpm, RR 14, Temp 36.7°C, SpO2 95% RA, BMI 33.2, Waist circumference 112 cm
- General: Obese male with central adiposity, appears tired
- HEENT: Mallampati class IV, redundant pharyngeal tissue
- Cardiovascular: Regular rate and rhythm, no murmurs
- Respiratory: Clear bilaterally, no wheeze
- Abdomen: Obese, non-tender, no hepatomegaly
- Genitourinary: Testes bilaterally descended, slightly soft in consistency, estimated volume 12 mL bilaterally (normal 15-25 mL), no varicocele, no masses, normal penile exam, DRE reveals smooth, mildly enlarged prostate (estimated 35 g) without nodules
- Musculoskeletal: Decreased muscle bulk in upper and lower extremities relative to body habitus, increased body fat
- Skin: Decreased facial and body hair density, fine periorbital wrinkling
- Breast: Mild bilateral gynecomastia (2 cm disc palpable)
Workup and Results
Laboratory Studies:
| Test | Result | Reference Range |
|---|---|---|
| Total testosterone (8 AM, fasting) | 7.2 nmol/L (208 ng/dL) | 8.7-29.0 nmol/L (250-836 ng/dL) |
| Repeat total testosterone (8 AM) | 7.8 nmol/L (225 ng/dL) | 8.7-29.0 nmol/L |
| Free testosterone (calculated) | 148 pmol/L | 225-725 pmol/L |
| SHBG | 18 nmol/L | 10-57 nmol/L |
| LH | 3.1 IU/L | 1.5-9.3 IU/L |
| FSH | 2.8 IU/L | 1.4-18.1 IU/L |
| Prolactin | 12.4 ng/mL | 2.1-17.7 ng/mL |
| Estradiol | 42 pg/mL | 10-40 pg/mL |
| PSA | 1.2 ng/mL | < 4.0 ng/mL |
| HbA1c | 7.4% | < 5.7% (normal) |
| Fasting glucose | 142 mg/dL | 70-100 mg/dL |
| Fasting insulin | 28.3 mU/L | 2.6-11.1 mU/L |
| Lipid panel | TC 238, LDL 152, HDL 34, TG 260 mg/dL | TC <200, LDL <100, HDL >40, TG <150 |
| CBC | Hgb 13.8 g/dL, Hct 41% | Hgb 13.5-17.5, Hct 38.3-48.6% |
| Hepatic panel | AST 48, ALT 62, GGT 88 U/L | AST <40, ALT <41, GGT <60 |
| DEXA scan | T-score lumbar spine -1.4 | > -1.0 normal |
| Vitamin D | 22 ng/mL | 30-100 ng/mL |
Imaging/Additional Studies:
- Pituitary MRI: Normal, no adenoma identified
- Sleep study review: AHI 32 events/hour (severe), lowest SpO2 78%
- Liver ultrasound: Hepatic steatosis (moderate)
- Body composition (DEXA): Total body fat 38%, visceral fat elevated, appendicular lean mass reduced for height (sarcopenic obesity)
Clinical Image
Diagram of the hypothalamic-pituitary-gonadal (HPG) axis illustrating the pathophysiology of secondary hypogonadism: the negative effects of obesity, sleep apnea, insulin resistance, and alcohol on GnRH and gonadotropin secretion leading to reduced testicular testosterone production. Source: Educational illustration.
Diagnosis
Secondary (Hypogonadotropic) Hypogonadism with Metabolic Syndrome, Uncontrolled Type 2 Diabetes, Severe Untreated Obstructive Sleep Apnea, and Sarcopenic Obesity
Key Diagnostic Criteria:
- Two confirmed early morning total testosterone levels below 8.7 nmol/L (250 ng/dL) with symptoms
- Low-normal LH and FSH indicating secondary (central) etiology
- Low free testosterone with low SHBG (consistent with metabolic syndrome)
- Multiple reversible contributors identified: untreated severe OSA, obesity, uncontrolled diabetes, excessive alcohol, hepatic steatosis
- Mildly elevated estradiol from peripheral aromatization in adipose tissue
- Osteopenia on DEXA (T-score -1.4) likely related to hypogonadism
Treatment Plan
- Address reversible causes first (3-6 month trial before considering TRT):
- Mandatory CPAP compliance for severe OSA (AHI 32) with follow-up adherence monitoring; untreated OSA suppresses gonadotropin secretion and is independently associated with low testosterone
- Alcohol reduction to < 10 units/week with brief motivational counseling; excessive alcohol directly impairs Leydig cell function and increases aromatase activity
- Structured weight loss program targeting 10% body weight reduction: caloric deficit of 500-750 kcal/day with high-protein intake (1.6 g/kg/day) to preserve lean mass
- Diabetes optimization: Increase metformin to 2000 mg daily if tolerated, add GLP-1 receptor agonist (semaglutide 0.25 mg weekly titrating up) for glycemic control and weight loss
- Exercise prescription: Resistance training 3x/week (compound movements, progressive overload) combined with 150 min/week moderate aerobic activity; resistance training directly stimulates testosterone production
- Nutritional intervention: Mediterranean dietary pattern, reduce refined carbohydrates, zinc 30 mg daily, vitamin D3 5000 IU daily, limit soy-based foods
- Reassess testosterone at 3-6 months: If testosterone remains < 8.7 nmol/L despite optimization of reversible factors, initiate testosterone replacement therapy (testosterone cypionate 100 mg IM weekly or transdermal testosterone gel 50 mg daily) with baseline PSA, hematocrit monitoring
- Monitoring if TRT initiated: PSA and hematocrit at 3, 6, and 12 months, then annually; bone density repeat at 2 years; assess for polycythemia (hematocrit > 54% requires dose reduction or phlebotomy)
Key Learning Points
- Testosterone deficiency must be confirmed with two early-morning fasting samples, as testosterone levels exhibit diurnal variation with peak levels at 7-9 AM and can be transiently lowered by acute illness, medications, and non-fasting status
- Secondary hypogonadism in obese men is frequently reversible; weight loss of 10-15% can increase testosterone by 2-4 nmol/L, making lifestyle optimization the first-line intervention
- Untreated obstructive sleep apnea suppresses pulsatile GnRH release and is a major reversible cause of hypogonadism that must be addressed before initiating testosterone replacement
- Low SHBG in metabolic syndrome leads to faster testosterone clearance and artificially lowers total testosterone; free testosterone calculation provides more accurate assessment in obese patients
- Testosterone replacement therapy in men with active, untreated severe OSA may worsen apnea; CPAP compliance must be established first