An NGU test confirms nongonococcal urethritis — inflammation of the urethra that isn't caused by gonorrhea. Diagnosis takes two steps. First you prove urethritis is present (white blood cells on a stain or first-void urine), then you run NAAT swab or urine tests to find the cause, such as chlamydia or Mycoplasma genitalium.
with the right treatment
testing, not symptoms, decides
| Item | Value |
|---|---|
| Curable? | yes — with the right treatment |
| Tested by | NAAT / lab |
| Often | no symptoms |
| If you may have it | get tested — testing, not symptoms, decides |
How NGU is tested
NGU is a syndrome rather than a single germ, so the test answers two separate questions. The first is whether your urethra is actually inflamed. The second is what's driving it. The gonorrhea-causing bacterium has to be ruled out before anything counts as "nongonococcal."
Many at-home explainers leave out the objective evidence of urethritis. A clinician confirms it one of a few ways: a Gram stain of urethral secretions showing at least two white blood cells per oil-immersion field with no gonococci visible, or a first-void urine sample that's positive for leukocyte esterase or shows at least ten white blood cells per high-power field CDC, 2021. Those white cells are the immune system's footprints, and their presence separates real urethritis from ordinary irritation.
Once urethritis is confirmed, the lab looks for a cause with a nucleic acid amplification test (NAAT) for chlamydia and gonorrhea, and in persistent cases for M. genitalium. The likely culprits include Chlamydia trachomatis, M. genitalium, and sometimes Trichomonas, herpes simplex virus, or adenovirus. In roughly half of all cases no organism is ever identified, which is normal and doesn't change how the inflammation is treated.
The sample
Most testing is painless and quick. You'll typically give a first-void urine sample — the first part of your stream, which carries cells flushed from the urethra — or a clinician takes a thin swab just inside the urethral opening. The stain step needs an in-person visit, but the pathogen NAATs run off the same urine or a self-collected swab. Results usually come back in a few days.
When to test after exposure
Symptoms of urethritis — discharge, burning when you pee, or itching at the tip — can show up within days to a couple of weeks after sex, and that's the time to get checked. But the organisms behind NGU each have their own incubation window, so testing too early can miss a real infection. If you have clear symptoms now, get seen now; if you're testing only because of an exposure with no symptoms, time it to the recommended window. Our guide on when to test after exposure walks through the right timing for each infection.
Who should get tested
Test if any of the following fits you:
- You have urethral discharge, burning with urination, or itching or irritation at the tip of the penis.
- A partner was diagnosed with chlamydia, gonorrhea, M. genitalium, or NGU.
- You've had new or multiple partners and want routine screening, since many sexually transmitted causes of NGU carry no symptoms at all.
- Your symptoms came back or never fully cleared after a previous course of treatment, which points toward persistent or recurrent ngu and may call for M. genitalium testing.
Getting tested: the visit, at-home kits, and cost
A clinic visit for symptoms is short. The provider asks about your symptoms and exposures, may do a quick look at the urethral opening, and collects urine or a swab. The white-cell confirmation generally needs a microscope or an on-site stain, so a symptomatic case is best handled in person, where a clinic can confirm the inflammation and start treatment the same day.
At-home and mail-in kits cover the pathogen side well: you collect a urine sample or swab yourself and ship it. They're a strong fit for routine screening or for checking a partner's exposure, but they don't perform the white-cell stain that defines urethritis, so a clear symptomatic case still warrants an exam. You can get tested through a lab order, and it helps to compare testing providers before you pick one.
Cost is rarely the barrier people fear. Health departments, Planned Parenthood, and Title X clinics offer this testing free or low-cost. A diagnosis here is common and treatable, and clinics handle it daily.
Reading your results
Your results come in two layers. The inflammation result tells you whether urethritis is confirmed from the white-cell finding on the stain or urine. The pathogen results tell you which organism, if any, turned up.
| Result | What it means |
|---|---|
| Urethritis confirmed, chlamydia or gonorrhea positive | You have urethritis with an identified cause; treatment targets that organism and gonorrhea is, by definition, no longer "NGU." |
| Urethritis confirmed, all pathogens negative | This is NGU with no organism identified — common, and still treated as urethritis. |
| Urethritis confirmed, persistent after treatment | M. genitalium testing is often added, since it's a frequent cause of cases that don't resolve. |
| No white cells, no symptoms | No objective urethritis; a positive NAAT may still mean an infection to treat, but it isn't urethritis on these criteria. |
If your test is positive
Treatment is a defined course — pills, and sometimes a cream or shot depending on the cause. Finish all of it even once you feel better, and ask whether your partner needs treating so you don't pass it back and forth. For full regimens and timelines see our treatment guide, and read about sex with ngu before resuming. People often ask can ngu go away on its own without treatment?, which is covered separately.
When to see a clinician
See a clinician promptly if you have urethral discharge, pain or burning when you pee, fever, or pain in the testicles or pelvis, and don't wait it out if a partner was diagnosed. In-person care matters most when symptoms are active, because the white-cell confirmation is part of an accurate diagnosis and lets treatment start that day.