I partecipated in a medical trial for an ED drug and all participants had a complete reproductive system examination in hospital lasting two days.
First day:
Sexual & medical history,
Genital exam including prostate DRE, urologic examination with urethral instruments,
Fasting glucose / HbA1c, Hormones (testosterone, LH, FSH, prolactin), PSA, Urinalysis
ECG, Echocardiography / stress test, blood pressure monitoring
Nocturnal penile tumescence
Second day:
Penile Doppler ultrasound
Pharmacologic erection test, cavernosometry
Uroflowmetry and Cystometry
Perineal and pelvic floor EMG
Penile biothesiometry with ejaculatory latency test (semen was also collected by a nurse for sperm analysis)
It was certainly the most accurate reproductive health examination I had.