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🏥 Male Infertility & Andrology: Complete Clinical Guide for Urology Residents

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🔬 SECTION 1: DEFINITIONS & EPIDEMIOLOGY

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🔬 SECTION 2: PHYSIOLOGY — THE HPG AXIS (Must Know Cold)

Hypothalamus → GnRH (pulsatile) →
Anterior Pituitary → LH + FSH →
Testes:
  LH → Leydig cells → Testosterone
  FSH → Sertoli cells → Spermatogenesis + Inhibin B

• Testosterone → negative feedback on hypothalamus & pituitary (suppresses LH/FSH) — this is why exogenous testosterone KILLS sperm production
• Inhibin B → negative feedback specifically on FSH
• Estradiol (E2) → aromatized from testosterone in Sertoli cells; elevated E2 (obesity, liver disease) suppresses HPG axis

• Full cycle: 72 days (spermatogonia → mature sperm)
• Epididymal transit: 12–21 days
• Clinical hack: Any gonadotoxic event (fever, chemo, illness) won't show in semen analysis until 2–3 months later. Always ask about illness 3 months prior to a bad SA.

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🔬 SECTION 3: HISTORY TAKING — STRUCTURED APPROACH

The 7-Domain Infertility History

• Abstinence: 48–72 hours before collection (not less, not more than 5 days)
• Analyze within 1 hour of collection at body temperature
• Minimum 2 samples to establish baseline (day-to-day variability is huge)

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🔬 SECTION 4: PHYSICAL EXAMINATION

Systematic Genital Exam

• Normal adult volume: 15–25 mL (Prader orchidometer)
• Small, firm testes (<15 mL) = primary testicular failure
• Small, soft testes = spermatogenic failure
• Trick: Testes <20 mL in a man with azoospermia → suspect non-obstructive azoospermia (NOA)

• Fullness/induration = obstruction
• Absent epididymis = consider congenital anomaly

• ALWAYS palpate bilaterally — congenital bilateral absence of vas deferens (CBAVD) is a critical finding
• Absent vas = CFTR mutation carrier → genetic counseling mandatory

• Examine standing, in warm room, with Valsalva
• Grade I: Palpable only with Valsalva
• Grade II: Palpable without Valsalva
• Grade III: Visible through scrotal skin
• 90% are left-sided (left gonadal vein drains at 90° to left renal vein vs. right gonadal vein at 45° angle to IVC)
• Hack: Isolated right-sided or bilateral varicocele → urgent renal ultrasound to rule out retroperitoneal mass/RCC

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🔬 SECTION 5: SEMEN ANALYSIS — WHO 2010 Reference Values

Terminology

• Retrograde ejaculation (check post-ejaculatory urine for sperm)
• Ejaculatory duct obstruction (EDO) → add transrectal ultrasound
• CBAVD (absent vas)
• Androgen deficiency
• Incomplete collection

Frequency of SA Findings in Infertile Men (Smith & Tanagho):

• All normal: 55%
• Low motility: 26%
• Low count: 8%
• No sperm (azoospermia): 8%
• Volume abnormal: 2%

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🔬 SECTION 6: HORMONAL EVALUATION

Minimum Panel:

Interpreting FSH + Testis Volume:

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🔬 SECTION 7: ADVANCED INVESTIGATIONS

Genetic Testing (Mandatory in These Cases)

• Indications: Azoospermia or severe oligospermia (<5M/mL)
• Klinefelter syndrome (47,XXY): Most common sex chromosome disorder. Small firm testes, elevated FSH/LH, low T. Mosaic forms (46XY/47XXY) may have sperm. Can attempt testicular sperm extraction.

• Indicated in: <5 million sperm/mL or azoospermia
• AZFa deletion: Complete absence of germ cells (Sertoli-cell-only) — TESE futile
• AZFb deletion: Maturation arrest — TESE rarely successful
• AZFc deletion (DAZ gene): Most common. Variable — sperm found in 50–70% on TESE. IVF/ICSI possible but sons will inherit deletion
• Counseling point: Men with AZFc deletions who conceive sons will transmit the deletion

• Indicated in: CBAVD, obstructive azoospermia with absent vas
• ~80% of men with CBAVD carry CFTR mutations
• Partner must also be tested (carrier frequency ~1/25 in Caucasians)
• If both carry mutations → 1:4 risk of CF in offspring

Post-Ejaculatory Urinalysis (PEU):

• Indicated: hypospermia (<1.5 mL) or cloudy urine post-ejaculation

• 10–15 sperm/hpf in post-ejaculatory urine = retrograde ejaculation

Transrectal Ultrasound (TRUS):

• Indicated: azoospermia + low volume + absent vas or suspected EDO
• EDO findings: dilated seminal vesicles (>1.5 cm), ejaculatory duct cysts/calculi, dilated ejaculatory ducts

Scrotal Ultrasound:

• Indicated: impalpable varicocele, testicular mass, epididymal abnormality
• Varicocele on Doppler: vein diameter >3 mm at rest or reflux with Valsalva

Testis Biopsy:

• Primarily to distinguish obstructive from non-obstructive azoospermia when hormones are equivocal
• Histological patterns: normal spermatogenesis (obstruction), maturation arrest, Sertoli-cell-only (SCO), hypospermatogenesis
• Clinical hack: In azoospermia with normal FSH + normal testis volume, the probability of obstruction is high — biopsy will likely show normal spermatogenesis

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🔬 SECTION 8: CAUSES OF MALE INFERTILITY — SYSTEMATIC CLASSIFICATION

Pre-Testicular (Hypogonadotropic Hypogonadism)

Testicular (Primary Failure)

Post-Testicular (Obstruction)

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🔬 SECTION 9: MEDICAL TREATMENT

Treatable Endocrine Causes:

• hCG 2000–5000 IU IM 3x/week × 6 months (stimulates Leydig cells → T production)
• Add FSH (recombinant FSH or hMG) if sperm count not improving after 6 months
• Expected: sperm appear in ejaculate in 60–70% within 12 months

• Cabergoline 0.5 mg twice weekly; more effective and better tolerated than bromocriptine
• After normalization, spermatogenesis recovers in 3–6 months

• Clomiphene citrate 25–50 mg/day (anti-estrogen → increases LH/FSH): improves sperm counts in 40–50%
• Anastrozole 1 mg/day (aromatase inhibitor): useful in obese men with elevated E2:T ratio >1:10
• Antioxidants (Vitamin C, E, Coenzyme Q10, NAC): modest evidence; reasonable to add given low risk

Retrograde Ejaculation Treatment:

• Pseudoephedrine 60 mg QID or imipramine 25 mg TID (sympathomimetic → closes bladder neck)
• Success ~40%; if fails → sperm recovery from urine + IUI

Infections:

• Pyospermia: doxycycline 100 mg BD × 4 weeks
• Treat partner simultaneously for STIs

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🔬 SECTION 10: SURGICAL TREATMENT

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10.1 VARICOCELECTOMY

1. Clinical varicocele (Grade I-III, palpable)
2. Abnormal semen analysis
3. Partner with normal/correctable fertility
4. Oligospermia with pain is also an indication

• Identifies and preserves testicular artery (Doppler probe intraoperatively)
• Identifies and preserves lymphatics (avoids hydrocele — the most common complication)
• Accesses all venous channels including external spermatic, gubernacular, and scrotal collaterals
• Recurrence <1% vs 9% conventional inguinal

Operative Tricks for Microsurgical Varicocelectomy:

1. Room temperature: Keep room warm — cold scrotum makes vein differentiation harder
2. Doppler probe: Use intraoperatively to identify the testicular artery before ligation — arteries are pulsatile, veins are not
3. Papaverine: Apply to testicular artery if it spasms — relieves arterial spasm instantly
4. Blue dye trick (isosulfan blue): Inject 0.25 mL subcutaneously into scrotal skin → lymphatics turn blue → spare them → prevents hydrocele formation (Goldstein technique)
5. Testis delivery: Deliver testis through wound to visualize gubernacular and scrotal collateral veins that would otherwise be missed — this reduces recurrence to <1%
6. Hemoclips vs sutures: Use hemoclips for veins; reserve sutures for arteries and lymphatics
7. How many veins? At the subinguinal level you may encounter 20–30 veins. Ligate all. Each time you ligate a vein, remaining veins dilate up and become visible.
8. Post-op: Ice packs, scrotal support, NSAIDs. Return to work 3–5 days. No heavy lifting 2 weeks.

• Hydrocele (7–39% if lymphatics not spared → <1% with blue dye technique)
• Testicular artery injury → testicular atrophy (0.3–2%)
• Recurrence (0.6–45% depending on technique)
• Hematoma

• Semen improvement: 60–80%
• Pregnancy rate: 35–44% at 1 year (vs 10% watchful waiting, 35% IVF)
• Return of sperm in azoospermic men: up to 50% with palpable varicoceles
• Bonus: Testosterone levels increase significantly after varicocelectomy (reverses the Leydig cell dysfunction)

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10.2 VASECTOMY REVERSAL

Vasovasostomy (VV):

• Indication: Obstruction at vas deferens level; fluid from vasal lumen contains sperm (even dead/heads-only) → proceed with VV
• Technique: Microsurgical, two-layer anastomosis preferred
  • Inner layer: 9-0 nylon mucosal sutures (6–8 sutures circumferentially)
  • Outer layer: 9-0 nylon muscularis sutures
• Success rates: Patency rate 95%+; pregnancy rate inversely related to obstructive interval

Epididymovasostomy (EV):

• Indication: Intraoperative finding of no sperm/thick toothpaste fluid from vas → epididymal obstruction present
• Technique: End-to-side or intussusception technique (TIVE/DIVE)
  • Intussusception technique (two-suture or three-suture): superior patency 65–85% vs 40–60% end-to-side
• Key: This is the most technically demanding procedure in male infertility surgery

Operative Decision Algorithm for Reversal:

At surgery: examine fluid from testicular-side vas lumen
→ Copious clear fluid with sperm (motile or not) = VV
→ No sperm but clear fluid = probably do VV (may work)  
→ Thick white/no fluid = epididymal blowout → EV required
→ Always prepare for EV; be ready to convert intraoperatively

1. Bowman probe test: Before committing to VV, irrigate abdominal side of vas with saline; confirm patency down to ejaculatory duct
2. Intraoperative frozen section: If uncertain whether spermatogenic failure is contributing, biopsy can guide management
3. Cryopreservation: During reversal surgery, always bank sperm retrieved intraoperatively (in case anastomosis fails)
4. Patient positioning: Dorsal lithotomy or supine with scrotum exposed; use headlight + microscope; warm irrigation

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10.3 SPERM RETRIEVAL TECHNIQUES

• MESA: more sperm, microscopically guided, can close tubule → preferred
• PESA: quicker, cheaper, no microscope needed → first attempt reasonable

• Under OS microscope, identify dilated, opaque seminiferous tubules (contain sperm) vs atrophic thin tubules (no sperm)
• Sperm found in 40–60% of NOA cases (vs 10–20% with conventional TESE)
• AZFa/AZFb deletions: <5% retrieval rate → counsel against procedure
• Klinefelter's: sperm retrieved in ~50% of mosaic and 30–40% of non-mosaic cases

1. Map the testis: In NOA, use multiple sampling sites (FNA mapping) before committing to Micro-TESE
2. Timing with oocyte retrieval: Coordinate with reproductive endocrinologist — sperm retrieval day before or day of egg retrieval
3. Fresh vs frozen: Fresh sperm preferred for ICSI; cryopreserve extra in case cycle cancelled
4. Hormonal priming for NOA: Some centers pretreat with hCG + FSH for 3 months before Micro-TESE → may improve yield

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10.4 EJACULATORY DUCT OBSTRUCTION (EDO) SURGERY

• Low volume + fructose-negative ejaculate + azoospermia + absent vas (if CBAVD excluded)
• TRUS: dilated seminal vesicles >1.5 cm, dilated EJ ducts, midline cysts

• Cystoscope; resect at verumontanum on both sides
• Confirm with injection of indigo carmine into seminal vesicle → blue dye efflux at verumontanum
• Trick: Inject methylene blue into seminal vesicle preoperatively under TRUS guidance → confirms exact level and guides resection
• Results: 50–65% improvement in semen parameters; 25–30% pregnancy

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10.5 CRYPTORCHIDISM (Relevance to Infertility)

• Before 2 years: best semen quality preservation
• Age 2–12: moderate improvement
• After puberty: limited benefit for fertility

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🔬 SECTION 11: AZOOSPERMIA — THE CLINICAL DECISION TREE

AZOOSPERMIA
    ↓
History + Exam + FSH + Testis Volume
    ↓
┌──────────────────────────────────────────────┐
│ FSH high + Small testes                       │
│ → NON-OBSTRUCTIVE AZOOSPERMIA (NOA)          │
│ → Genetic workup (Karyotype, AZF, CFTR)      │
│ → Consider Micro-TESE if AZFa/b excluded      │
└──────────────────────────────────────────────┘
    ↓
┌──────────────────────────────────────────────┐
│ FSH normal + Normal testis volume             │
│ → OBSTRUCTIVE AZOOSPERMIA (OA)               │
│ → Is vas palpable?                            │
│   No vas → CBAVD → CFTR testing + MESA/IVF   │
│   Vas present → TRUS (EDO?) + Diagnostic     │
│               biopsy if needed                │
│   → Vasectomy history → Reversal vs MESA+IVF │
└──────────────────────────────────────────────┘

• OA: Normal spermatogenesis but physical blockage → MESA + ICSI OR reconstruction (vasectomy reversal/EV)
• NOA: Impaired spermatogenesis — need Micro-TESE; hormones, testes small or normal, FSH often elevated

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🔬 SECTION 12: MEDICATIONS CAUSING INFERTILITY

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🔬 SECTION 13: SPERM BANKING

• Before chemotherapy or radiation
• Before vasectomy (or elective)
• Before high-risk surgery (retroperitoneal, bladder neck)
• Azoospermic men undergoing surgical sperm retrieval (cryopreserve extra)
• Military deployment
• Occupational hazards (radiation workers)

• Glycerol-based cryoprotectant
• Stored in liquid nitrogen (-196°C)
• Survival after freeze-thaw: 40–60% motility loss
• Stored indefinitely; children born from decades-old frozen sperm are healthy

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🔬 SECTION 14: ASSISTED REPRODUCTIVE TECHNIQUES (ART) — What the Urologist Must Know

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🔬 SECTION 15: CLINICAL SCENARIOS & HIGH-YIELD HACKS

Scenario 1: Young man, 2 years infertility, large left varicocele, SA shows count 8M/mL, 22% motility

Scenario 2: Azoospermia + no vas palpable bilaterally

Scenario 3: Azoospermia, FSH 42 IU/L, testis 8 mL bilaterally

Scenario 4: Azoospermia, FSH normal, vas palpable, history of vasectomy 12 years ago

Scenario 5: Low ejaculate volume 0.5 mL, pH 6.5, fructose negative, azoospermia

Scenario 6: Man on testosterone therapy wants to have children

Scenario 7: Bilateral varicocele seen on ultrasound, not palpable

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🔬 SECTION 16: HEMATOSPERMIA

• Age >40 or persistent >3–4 weeks: TRUS + PSA + urine cytology
• Rule out: prostate cancer, seminal vesicle cysts, urethral polyps, TB, schistosomiasis (in endemic areas)

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🔬 SECTION 17: OPERATIVE SUMMARY TABLE

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📚 Sources

• Campbell-Walsh-Wein Urology, 11th Edition — Chapters on Varicocele, Male Reproductive Surgery, Erectile Function
• Smith and Tanagho's General Urology, 19th Edition — Chapter 44: Male Infertility; Chapter 45: Sperm Retrieval
• Hinman's Atlas of Urologic Surgery
• WHO Laboratory Manual for the Examination of Human Semen, 5th Ed (2010)

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