What It Could Mean If You Have UTI Symptoms But A Normal Urine Culture
Over half of women get a urinary tract infection (UTI) at some point in their lives, but even more experience symptoms of one. Sometimes, people will have all the telltale signs of a UTI — a constant urge to pee even when nothing's in there, burning while peeing, and/or pain in the bladder — but their urine cultures will come up negative. Does this mean you have a UTI that's just not showing up on tests, or does it point toward a different health issue? It turns out those are both possibilities.
Dana Rice, board-certified urologist and creator of the UTI Tracker app, cautions against taking antibiotics if you have no confirmed UTI, even if you have symptoms. "In a world with increasing significant multi-drug resistant (MDR) bacteria, I am not a fan of antibiotics without culture positive results," she tells Bustle. "I think that part of the increase in MDR organisms is the overuse of antibiotics for urinary symptoms that feel like a classic UTI but are not truly infectious in nature."
In addition, there are healthy bacteria in your bladder that you don't want to kill if you can avoid it, she says. "I currently encourage my patients to avoid antibiotic usage as much as possible because I do believe that patients who are given multiple antibiotic courses for culture negative standard tests are destroying their own natural biomes and are having more difficulty establishing equilibrium (or normal) bladder state."
How do you know if you actually have a UTI or something else, though? And what else could you have? Here are a few things UTI symptoms with negative test results could point toward.
1A UTI That The Test Isn't Detecting
One possibility is that you really do have a UTI. Standard urine cultures don't always detect them. One study in Clinical Microbiology and Infection found that one in five women with UTI symptoms had negative results on the standard tests, but almost all these women had UTIs according to the more sensitive quantitative polymerase chain reaction (qPCR) test.
"Standard urine cultures test for specific types of bacteria, but many women will have infections that are not able to be grown in these cultures," says Rice. "Another possible reason for a false negative test (no bacteria grown) is that often, the test requires a certain number of bacteria to be grown in culture. For instance, if someone has just urinated prior to leaving a sample and there is not a sufficient quantity of urine built up in the next voided sample, it is possible for a standard urine culture to report negative findings." A false negative can also occur if you've already taken antibiotics, so make sure not to do that.
If you think you might have a UTI that's not being detected, your doctor may be able to do a PCR laboratory test, says Rice. Jennifer Linehan, M.D., urologist and associate professor of urology and urologic oncology at the John Wayne Cancer Institute at Providence Saint John’s Health Center in Santa Monica, tells Bustle that another type of test called Next-Generation Sequencing (NGS) is even more accurate.
Even then, it may not always be clear what your results mean because doctors don't fully understand which bacteria do and don't belong in the urine, says Linehan. Not all bacteria are problematic; some are healthy bacteria that get into the sample from the vagina, and others are just part of the urinary microbiome. So, the presence of bacteria doesn't necessarily mean you have a UTI. Your doctor should be able to help you interpret the results, or you may even want to consult multiple doctors.
2Urethra Irritation From Sex
"I have many patients with urethritis after intercourse who believe they have UTIs, but when I culture before and after, the cultures are negative," says Rice. People sometimes even call the UTI-like symptoms you can get from sex "honeymoon cystitis." If this is what you're dealing with, the symptoms should go away within a few days without antibiotics. "Often, if I prescribe natural supplements and bladder pain relief medications, the symptoms are limited to less than 24 hours," says Rice.
Interstitial cystitis is a chronic bladder condition that mimics many of the symptoms of UTIs — bladder and/or urethra irritation, frequent urination, and a constant feeling like you have to pee — but it's not caused by an infection. It's unknown what causes it, and the causes may be different for different patients. Some have visible damage to the bladder lining that appears to be causing the discomfort, but others don't.
"There are many working theories including an autoimmune component, chronic inflammation, and even neurologic causes, but currently there is no one hallmark cause and effect for this diagnosis," says Rice. "Interstitial cystitis/bladder pain syndrome is generally a diagnosis of exclusion unless patients have very textbook symptoms. This means when everything else including infection and anatomical conditions are ruled out, then I start to consider IC as a diagnosis. I will find that many patients who come to me with a diagnosis of IC/BPS simply have not had an adequate history, physical, or workup performed."
Some STIs, like gonorrhea and chlamydia, cause symptoms like frequent urination and bladder pain that can be confused with a UTI, family medicine doctor Sheryl Recinos, MD tells Bustle. You should be able to rule these out or in pretty easily by getting an RNA-based test, she says.
Some people develop UTI-like symptoms in response to bladder irritants, like caffeine, spicy foods, and citrus foods, because their bladders are hypersensitive, says Linehan. You can test for bladder hypersensitivity with a urodynamics test, where the bladder is filled with a very small amount of fluid. "If the patient reports that they have to urinate when only a small amount is in the bladder, that is hypersensitivity," says Linehan. Often, this problem will go away simply through dietary changes.
If UTIs go untreated, they'll often clear out on their own, but sometimes, they can make their way up to the kidneys, and a kidney infection requires immediate attention, says Linehan. If you begin to experience signs of a kidney infection, like blood in your urine, fever, or back pain, talk to your doctor right away.