Specialized and Forensic Collections

Some urine collections are designed to identify the anatomic source of infection, while others are designed to document specimen identity and integrity. In both settings, correct collection and documentation are essential to interpretation.

Prostatitis localization

Prostatitis localization is based on comparison of sequential specimens collected before and after prostatic massage. The distribution of organisms among the specimens helps identify the likely site of infection. The classical Meares-Stamey four-glass protocol includes:

All four specimens are cultured, and the urine portions are also examined microscopically. Prostatic localization is supported when an organism is recovered from the prostatic specimens but not from the specimens collected before massage, or when substantially greater growth occurs in the prostatic specimens.

The two-glass pre- and post-massage test is a simpler alternative. It compares a clean-catch urine specimen collected before prostatic massage with one collected afterward and provides results that generally agree with the four-glass method. The simpler procedure is used more commonly in practice.

Definitions of substantially greater growth and leukocyte thresholds for supporting inflammation vary among references and laboratory procedures. Interpretation should follow the criteria in the local procedure.

Federal workplace drug testing

Federal workplace urine drug testing uses a formal chain-of-custody process to document specimen identity and integrity from collection through testing. The record identifies each person who handled the specimen and documents the condition of its seals.

For U.S. federal workplace urine testing:

• At least 45 mL is collected and divided between a 30 mL primary bottle (A) and a 15 mL split bottle (B).
• Specimen temperature is measured within four minutes of collection. The acceptable range is 32–38 °C (90–100 °F). A temperature outside this range requires a directly observed collection.
• The specimen is sealed, initialed, and documented in the donor’s presence.

The certified laboratory, rather than the collector, determines whether a specimen is dilute, substituted, adulterated, or invalid. This determination uses creatinine and specific gravity according to criteria in the federal Mandatory Guidelines. Programs outside federal testing follow their own governing requirements, which may use different collection volumes, temperature limits, or procedures.

Worked example. A specimen temperature measured within four minutes of collection is outside the acceptable range of 32–38 °C. Federal procedure requires the collector to begin a directly observed collection. The certified laboratory later determines whether the original specimen is dilute, substituted, adulterated, or invalid.

References

1. Bonkat G, Kranz J, Cai T, et al. EAU Guidelines on Urological Infections. European Association of Urology; 2026.
2. Nickel JC, Shoskes D, Wang Y, et al. How does the pre-massage and post-massage 2-glass test compare to the Meares-Stamey 4-glass test in men with chronic prostatitis/chronic pelvic pain syndrome? J Urol. 2006;176(1):119-124.
3. Substance Abuse and Mental Health Services Administration. Medical Review Officer Guidance Manual for Federal Workplace Drug Testing Programs. Effective 1 February 2024.
4. Mandatory Guidelines for Federal Workplace Drug Testing Programs, Urine. 88 Fed. Reg. 70768-70810 (12 October 2023), effective 1 February 2024.