What's nitrite in urine?
Daniel Moore
Published Jan 15, 2026
A urinalysis, also called a urine test, can detect the presence of nitrites in the urine. Normal urine contains chemicals called nitrates. If bacteria enter the urinary tract, nitrates can turn into different, similarly named chemicals called nitrites. Nitrites in urine may be a sign of a urinary tract infection (UTI).
What causes positive nitrite in urine?
What causes nitrites in urine? The presence of nitrites in urine most commonly means there's a bacterial infection in your urinary tract. This is usually called a urinary tract infection (UTI). A UTI can happen anywhere in your urinary tract, including your bladder, ureters, kidneys, and urethra.
Does positive nitrite mean UTI?
A positive result on the nitrite test is highly specific for UTI, typically because of urease-splitting organisms, such as Proteus species and, occasionally, E coli; however, it is very insensitive as a screening tool, as only 25% of patients with UTI have a positive nitrite test result.
Is it normal to have nitrites in urine?
What does having nitrites in urine mean? Urinary tract infections are the most common cause of nitrites in urine. These occur when bacteria infect the bladder, ureters, or kidneys. A doctor can easily diagnose a urinary tract infection (UTI) by testing a urine sample.
What bacteria cause nitrites in urine?
Gram-negative enteric organisms produce urinary nitrite and represent the most common uropathogens. Enterococcus, a less common uropathogen, does not produce nitrite and has a unique antibiotic resistance pattern.
41 related questions foundCan you have nitrites in urine without infection?
What do the results mean? If there are nitrites in your urine, it may mean that you have a UTI. However, even if no nitrites are found, you still may have an infection, because bacteria don't always change nitrates into nitrites.
What antibiotic is used for nitrates in urine?
We recommend the use of nitrofurantoin or cephalexin in the treatment of cystitis. If LE is negative, nitrofurantoin is preferable to cephalexin. Second or third generation cephalosporins are appropriate antibiotics in the management of complicated UTI or when pyelonephritis is highly suspected.
How do you get rid of nitrates in urine naturally?
To treat a UTI without antibiotics, people can try these approaches.
- Stay hydrated. Drinking enough water can help prevent and treat UTIs. ...
- Urinate when the need arises. ...
- Drink cranberry juice. ...
- Use probiotics. ...
- Get enough vitamin C. ...
- Wipe from front to back. ...
- Practice good sexual hygiene.
Can a positive UTI test mean something else?
False positives may present if the urine specimen appears red due to any cause; for example, recent ingestion of common UTI pain relief medication containing phenazopyradine dye or contamination with menstrual fluid.
What is a positive UTI result?
What does a positive urine culture test result mean? If bacteria grow in the urine culture test and you have symptoms of an infection or bladder irritation, it means you have a UTI. This result is a positive urine culture test or abnormal test result.
Can a UTI go away on its own?
“Yes, a UTI could go away on its own, but some infections are different than others,” he says. “And if left untreated, it may linger longer.” UTIs are classified into two main categories: uncomplicated, also known as cystitis; and complicated, which may be catheter-associated or happen during pregnancy.
How do you lower nitrites?
Treatment of Nitrite Poisoning
First, perform water changes with dechlorinated water to reduce the nitrite level. The addition of a half-ounce (1 tablespoon) of salt per gallon of water will prevent methemoglobin toxicity by blocking the nitrite absorption through the fish's gills.
What's the difference between leukocytes and nitrite?
When your urine is nitrite positive, it likely means there's a bacterial infection. Leukocyte negative means that the amount of white blood cells in your urine are low and not secreting leukocyte esterase, which is a compound white blood cells excrete when they're activated, or fighting off an infection.
Why do I have leukocytes in my urine but no nitrates?
Leukocytes in the urine without nitrite
If the test for leukocyte esterase is positive but finds no nitrite, an infection may still be present. The test is particular to certain bacterial enzymes, which means it can pick up specific bacterial infections with more certainty.
Does chlamydia cause nitrites in the urine?
Of women with dysuria as their only symptom, 67% had a negative urinary nitrite; however, only 7% received chlamydia testing. Of 12 women with a positive chlamydia test, 83% had a negative urinary nitrite.
What is best antibiotic for urinary tract infection?
Drugs commonly recommended for simple UTIs include:
- Trimethoprim/sulfamethoxazole (Bactrim, Septra, others)
- Fosfomycin (Monurol)
- Nitrofurantoin (Macrodantin, Macrobid)
- Cephalexin (Keflex)
- Ceftriaxone.
Why does it burn when I pee but no UTI?
A burning feeling is usually a symptom of a problem somewhere in the urinary tract. Urethral stricture disease, prostatitis, and kidney stones are possible causes of this symptom, and they are all curable. Treatment can often relieve the symptoms of painful bladder syndrome if this is the underlying issue.
What is a silent UTI?
A silent UTI is just like a regular UTI, only without the typical symptoms that prove our immune system is fighting off the infection. That's why those with weaker immune systems, especially the elderly, are more prone to silent UTIs. Urinary tract infections are risky to begin with.
How long does it take for a UTI to go away without antibiotics?
How long does a UTI last untreated? Some UTIs will go away on their own in as little as 1 week. However, UTIs that do not go away on their own will only get worse over time. If you think you have a UTI, speak with a doctor about the best course of action.
How can I get antibiotics for a UTI without going to the doctor?
Antibiotics are not available without a prescription in the United States. You will need to talk to a doctor or nurse practitioner to get a prescription. You can do this in person, over the phone, or over video. If this is your first UTI, it can be helpful to see a doctor in person.
Is banana good for urinary tract infection?
Bananas and other high-fiber foods can be good for urinary tract health and preventing urinary tract infections (UTIs) by encouraging regular bowel movements and relieving pressure on urine flow.
What is the fastest way to get rid of a bladder infection?
Most bladder infections are treated with antibiotics. This is the fastest way to get rid of a bladder infection.
...
Medications to treat bladder infections include:
- Nitrofurantoin (Macrobid)
- Trimethoprim-sulfamethoxazole (Bactrim)
- Fosfomycin (Monurol)
Does E. coli cause nitrites in urine?
Several uropathogens, such as E. coli, Klebsiella, and Proteus, can reduce nitrate to nitrite, whereas others do not have this ability.
What does nitrite positive mean?
A positive nitrite test usually means infection. It generally requires more than 10,000 bacteria per mL to turn the nitrite dipstick positive, making it a specific but not a sensitive test. A negative nitrite test does not rule out a UTI, but a positive one strongly suggests infection.
How long do nitrates stay in your system?
A majority of ingested nitrate is excreted in the urine within 24 hours.