If you've ever visited a doctor for UTI symptoms, you're probably familiar with urine dipsticks and urine culture testing – the most common tests used to diagnose UTIs. What you may not be familiar with however is what each test can and cannot tell you. Here's what each test actually does, and where the standard approach falls short.

Urinalysis is the fast one. There are dipstick versions of this, often available over the counter, as well as laboratory versions of it which are more precise. It checks for things like leukocyte esterase (an enzyme tied to white blood cells), nitrites (only some bacteria produce these so a negative nitrite result doesn't rule out a UTI), and white blood cells. It's quick, but it only tells you there might be an infection based on these different markers. It doesn't tell you which pathogen is causing your symptoms, if any.

Urine culture is still the most common test for UTIs. The lab tries to grow whatever's in your urine on a petri dish over several days, then measures it against a "colony-count threshold." Unfortunately, a high proportion of urine cultures return false-negatives. Culture-negative UTIs, as they are called, occur for several reasons: the pathogen may grow too slowly, cannot grow under laboratory conditions at all, or sits below the reporting threshold for a positive. If you have persistent symptoms with "normal" or "no growth" urine cultures, you may need better laboratory testing to more confidently rule out an infection.

PCR looks for specific pathogen DNA instead of trying to grow anything. It's often faster and more sensitive than culture, and can flag antibiotic-resistance genes. However, it is limited because it only looks for specific pathogens – it can only find what the test was designed to detect. Atypical bacteria or fungi not included in the panel get missed. And because it's so sensitive, it can sometimes pick up DNA that isn't actually the root cause, so results need to be read alongside symptoms.

Next-generation sequencing (NGS) also reads pathogen DNA, but instead of a fixed panel it sequences all the pathogen DNA in the sample and matches it against a database filled with a vast amount of information for all different types of pathogens. That means it can catch atypical and hard-to-grow pathogens, and identify antibiotic-resistance markers — with a turnaround similar to or faster than culture. The main drawback is that it's newer, so insurance coverage and regulatory adoption are still catching up.

Quick FAQ:

- What's the most accurate UTI test?

No single test wins for everyone, but NGS-based tests give the most comprehensive view. This matters most for people who have unexplained or unresolved urinary symptoms, get recurrent UTIs, or at high-risk of complications if they were to get a UTI.

- Can you diagnose a UTI without a urine culture?

Yes. Both PCR and NGS detect pathogen DNA directly, which is useful when cultures keep coming back negative despite symptoms.

- How long do results take?

Dipstick: minutes. Urinalysis/standard urine culture: 2–5 days. PCR: 2-3 days. NGS: similar to or faster than culture, with more detail.

- Negative urine culture but still symptomatic?

That's one of the most common reasons people look into advanced testing. A negative, normal, or no growth urine culture test result doesn't necessarily mean there is no infection. In these cases, advanced testing may find something urine culture is missing.

We did a deep dive into the different types of diagnostic testing for UTI on our blog. Learn more here: https://biotia.io/blog/how-are-utis-diagnosed 

Not every burning sensation or urgent bathroom trip is a urinary tract infection (UTI) and knowing the difference matters. Here's a rundown of what UTI symptoms actually look like, when they're serious, and what else can masquerade as one.

Why symptoms happen
UTIs occur when microorganisms enter the urinary tract and multiply. The symptoms you feel depend on the pathogen, your immune response, and where in the urinary tract the infection sits. When a pathogen infects the lower tract, it irritates the lining of the urethra and bladder, triggering inflammation and the nerve signals behind that urge to urinate.

Common UTI symptoms
Burning or pain when urinating (dysuria); a strong, sudden urge to go; urinating more often in smaller amounts; pelvic discomfort or pressure; cloudy or foul-smelling urine; and blood in the urine (a pink, red, or brown tinge).

Warning signs it may have reached your kidneys
Pyelonephritis happens when a pathogen moves from the lower to the upper urinary tract, triggering a whole-body response. Watch for fever or chills, back or flank pain just below the ribs, nausea, vomiting, or feeling generally unwell. Seek care promptly if these appear as this condition can become life-threatening.

What else can mimic a UTI
This is the part a lot of people miss. Other conditions can cause similar symptoms, which is exactly why it's worth seeing a doctor when you first suspect a UTI. Common mimics include vaginitis or yeast infections, STIs like gonorrhea, chlamydia, or trichomonas, overactive bladder or pelvic floor dysfunction, interstitial cystitis/bladder pain syndrome, kidney stones, chronic prostatitis, and medication irritation.

A couple of things worth knowing
- You can test positive without symptoms — that's asymptomatic bacteriuria, which is considered a separate condition from UTI and is often not treated with antibiotics.
- Core symptoms (burning, urgency, frequency) are similar in men and women, but men may also have rectal pressure due to the prostate, and older adults of any sex can present atypically — sometimes with confusion or fatigue instead of classic urinary symptoms.

When symptoms persist
If symptoms persist despite antibiotics, or standard urine cultures keep coming back negative, more comprehensive testing may help. The BIOTIA-ID Urine Test uses next-generation sequencing to identify over 40 urogenital pathogens — including organisms standard culture often misses — along with antibiotic resistance markers, which helps a clinician pinpoint the cause and decide which treatments might work best. It's especially useful when symptoms persist or cultures stay negative despite ongoing symptoms.

The bottom line
UTI symptoms come from a pathogen damaging the lining of the urinary tract and triggering inflammation. If you're experiencing burning, urgency, frequency, pelvic discomfort, or cloudy/bloody urine, seek medical care.

Sources: Hooton TM, N Engl J Med 2012 (PMID 22417256); Nicolle LE, Clin Geriatr Med 2009 (PMID 19765490); Foxman B, Am J Med 2002 (PMID 11857800).

Full blog post here: https://biotia.io/blog/uti-symptoms

UTIs are one of the most common infections in the world. In the US alone, they account for more than 8 million doctor visits every year. But a lot of the basics are never explained. Here's a clean rundown, developed by clinicians.

What it is
A urinary tract infection affects part of the urinary system, which consists of your kidneys, ureters, bladder, or urethra. Most UTIs hit the lower tract (bladder and urethra); infections that reach the kidneys are less common but more serious. They're usually caused by bacteria, sometimes fungi, with the bacteria often originating from the gut and the area around the urethra.

Who's at higher risk
Women are at higher risk than men, and risk tends to rise with age as your immune system and genitourinary system changes. Common risk factors across any sex include a prior UTI, recent sexual activity, dehydration and infrequent urination, constipation, recent antibiotic use, catheters, being immunocompromised, and kidney or bladder stones.

Symptoms to know
The most common symptom is painful or burning urination (dysuria), along with a strong, sudden urge to go, urinating more often in smaller amounts, pelvic pressure, and cloudy or foul-smelling urine. Fever isn't always present, but when it shows up alongside back/flank pain, chills, or nausea, it can signal the infection has reached the kidneys (pyelonephritis), which needs prompt care.

One thing that surprises people: you can have a pathogens in your urinary tract with no symptoms at all, called asymptomatic bacteriuria, and in healthy adults this often doesn't need treatment. Treatment for asymptomatic bacteriuria is usually recommended during pregnancy or before certain urologic procedures.

How they're diagnosed
A UTI is a clinical diagnosis based on current symptoms, medical history, and lab results. The two standard urine tests are urinalysis (fast, checks for chemical signals of infection) and urine culture (sent to a lab to grow the pathogen, which can take several days). Both have their limitations, and both can be thrown off by recent antibiotic use.

Newer options are changing this. Next-generation sequencing tests look for pathogen DNA directly from the urine, rather than trying to grow it — worth knowing about because standard urine culture misses up to 1 in 3 UTIs. The BIOTIA-ID Urine Test, for example, uses NGS to identify 40+ urogenital pathogens (including ones culture often misses) and provides antibiotic resistance information to guide treatment — particularly useful for recurrent, complicated, or culture-negative cases.

When to see a doctor
Seek prompt care if you have UTI symptoms, and immediate care if you have fever, chills, back/flank pain, nausea, or vomiting alongside urinary symptoms.

Sources: Foxman B, Infect Dis Clin North Am 2014 (PMID 24745487); Hooton TM, N Engl J Med 2012 (PMID 22417256); Nicolle LE et al, Clin Infect Dis 2005 (PMID 15714408).

Full blog post here: https://biotia.io/blog/what-is-a-uti

Did you know that we are a collaborator of Live UTI Free, the leading advocacy organization for patients managing recurrent urinary tract infections (rUTIs)? At Biotia, we believe that patients should know their options when it comes to unexplained or unresolved urinary symptoms. Next-generation sequencing (NGS) testing can be useful for patients who have yet to find answers through standard urine culture tests. Read Live UTI Free's write up on Biotia's test to treat service for patients with recurrent, complicated, or culture-negative urinary tract infections to learn more.

BIOTIA-DX Resistance has won Best Antimicrobial Resistance Phenotype Prediction in the Critical Assessment of Massive Data Analysis (CAMDA) 2026 AMR Challenge for the second year in a row.

Our award-winning AMR prediction tool is already integrated into our flagship diagnostic assay, the BIOTIA-ID Urine Test, which is available for patients and providers across all 50 U.S. states to diagnose recurrent and complicated urinary tract infections.

This additional feature allows for optimal treatment selection based on the antibiotic resistance genes detected in the 44 key UTI-causing pathogens included on our clinical report.

Read the full press release here: https://www.prnewswire.com/news-releases/biotia-launches-clinically-approved-drug-resistance-reporting-for-complicated-utis-backed-by-second-consecutive-camda-win-302776254.html