Treatment of Urethral Discharge Without Pyuria

Diagnostic Approach

For patients with urethral discharge but no pyuria, the European Association of Urology recommends performing nucleic acid amplification testing (NAAT) for Neisseria gonorrhoeae and Chlamydia trachomatis on first-void urine or urethral swab, and if symptoms are mild, delay treatment until NAAT results guide pathogen-directed therapy 1
The absence of pyuria does not exclude sexually transmitted urethritis, with low sensitivity of urethral swabs and first-catch urine for detecting polymorphonuclear leukocytes for C. trachomatis (29%), Mycoplasma genitalium (50-62%), and Ureaplasma urealyticum (33%) in patients without visible discharge is not a reliable indicator 1

Perform Gram stain of urethral discharge or smear for preliminary diagnosis of gonococcal urethritis (looking for Gram-negative intracellular diplococci), as recommended by the European Urology guidelines 1
Obtain validated NAAT on first-void urine or urethral swab before empirical treatment to diagnose both chlamydial and gonococcal infections, as recommended by the European Association of Urology guidelines 1, 2
Perform urethral swab culture if NAAT is positive for gonorrhea to assess antimicrobial resistance profiles, as recommended by the European Urology guidelines 1

For patients with mild symptoms, the European Association of Urology guidelines recommend delaying treatment until NAAT results are available to guide pathogen-directed therapy based on local resistance data 1, 2
For patients with severe urethritis or inability to follow-up, initiate empirical treatment immediately, as recommended by the European Urology guidelines 2

For suspected gonococcal infection, the European Association of Urology guidelines recommend Ceftriaxone 1 g IM or IV single dose PLUS Azithromycin 1 g PO single dose 1, 2
For non-gonococcal urethritis (unidentified pathogen), the European Urology guidelines recommend Doxycycline 100 mg PO twice daily for 7 days 1, 2
For confirmed Chlamydia trachomatis, the European Urology guidelines recommend Azithromycin 1.0-1.5 g PO single dose OR Doxycycline 100 mg PO twice daily for 7 days 1

Sexual partners must be treated while maintaining patient confidentiality, as recommended by the European Association of Urology guidelines 1, 2, 3
Use pathogen-directed treatment based on local resistance data whenever possible, as recommended by the European Urology guidelines 1
Consider Mycoplasma genitalium in persistent cases, which may require moxifloxacin 400 mg daily for 7-14 days if macrolide resistance is present, as recommended by the European Urology guidelines 1, 3