Whoop Heart Health
A 45-biomarker heart health panel inspired by the WHOOP Heart Health Panel — an advanced look at cholesterol, lipoproteins, inflammation and kidney function.
Leukocytes are white blood cells. Normally they have no place in your urine. The expected result is therefore negative. Does your result say trace, 1+, 2+ or 3+? Then immune cells are active somewhere in your urinary tract. That does not yet mean you have a bladder infection. The dipstick does not measure those cells directly. It measures leukocyte esterase, a substance the cells release. So the pad can be positive while the lab sees almost no cells. What your result really means depends on your symptoms and on what a culture grows. And note: this is entirely separate from the leukocytes in your blood.
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Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.
The dipstick checks whether your urine contains leukocyte esterase. That is a substance released by white blood cells during inflammation. So the pad never sees the cell. It sees what the cell leaves behind.
That sounds like a detail, but it explains a lot. The pad can be positive while the sediment under the microscope counts almost nothing. The cells have already fallen apart. Perhaps your urine was very dilute, or the sample stood too long.
So there are two ways of looking at the same thing. The pad is fast and rough. The urine sediment actually counts the cells, in the lab.
You do not get a number with a unit back, but a scale:
| Result | What you do with it |
|---|---|
| negative | the expected result; without symptoms nothing is needed |
| trace | borderline; repeat on a clean-catch morning sample |
| 1+ or 2+ | immune cells present; read it alongside your symptoms |
| 3+ | clearly present; have a doctor assess this |
That scale rises with the amount of substance, not with how serious something is. A 3+ deserves a doctor's explanation. But on its own it is not a diagnosis.
The honest summary: this pad is sensitive but not accurate. It rarely misses genuine inflammation. But it also turns positive without infection.
So the answer to 'do I have a bladder infection' is usually: maybe. What makes that more or less likely can be spelled out.
Do you have symptoms? Pain or burning when passing urine, a strong urge, cloudy urine. With symptoms, a positive pad counts for a good deal more than without.
Is the nitrite positive too? A positive nitrite test is less common, but far more convincing. Nitrite only appears once bacteria in the urine convert nitrate. Leukocytes and nitrite together, with symptoms, point strongly to a bacterial bladder infection.
Is the pad positive but the nitrite negative? Then it stays open. Not every bacterium produces nitrite.
That is why your doctor often requests a urine culture anyway. It shows which bacterium is involved, and which antibiotic works. A pad alone cannot establish that. The culture gives the answer; the pad only asks the question.
Sometimes the culture stays negative while leukocytes are present. That is called sterile pyuria. Investigation in a different direction is then needed. Think of an STI test, or looking at kidney stones and medication.
If a bladder infection goes untreated, it can travel up through the ureters to your kidneys. That is rare. But it is the reason to take fever and flank pain seriously.
One thing matters. A positive pad is never on its own a reason for antibiotics. In older people a positive result without symptoms is common, and usually needs no treatment.
Have this test done if you have symptoms that fit the urinary tract. Think of pain or burning when passing urine. Or going more often, a constant urge and cloudy urine. Lower abdominal pain counts too.
It is also a standard part of a wider urine screen. For instance when your kidneys are being checked.
How you collect matters more than the pad itself. Collect midstream urine. Let the first stream run and only then collect. That first stream flushes out the bacteria that entered the bladder through the urethra. Those say nothing about your bladder. Clean the area first and do not touch the inside of the container.
Morning urine is the most concentrated and usually the most useful.
Deliver your sample within two hours, or put it in the fridge. Urine that stands for a long time changes.
Are you on your period? Postpone the test. Blood in the sample makes the result unusable.
Do you have fever, chills, nausea or pain in your side? Then make contact the same day. You do not wait for a dipstick for that.
Negative is the result you want, and it causes no symptoms. No leukocyte esterase was found at that moment. That does not fully rule out an infection. A few things can make the pad falsely negative. A high dose of vitamin C is the best known. Very concentrated urine does it too, as do high glucose or protein levels. Some antibiotics you have just taken inhibit the reaction as well. Do your symptoms persist while the pad stays negative? Then go back to your doctor. Trust your symptoms rather than that result.
A positive result by itself produces no symptoms. What you feel comes from the underlying cause. With a bladder infection that usually means pain on passing urine. A strong urge and cloudy urine often come with it. But a positive pad without symptoms also happens. In older people it is very common, and it usually needs no treatment. Another frequent cause is simply a sample that was not collected cleanly. Cells then reach your container that never came from your bladder. And sometimes the inflammation sits higher, in the kidneys. So discuss fever, chills, nausea or pain in your side with a doctor the same day.
There is little to improve in your lifestyle for this test. What does matter a lot is how you collect the sample. An unclean sample is the most common reason for a result that makes no sense.
Clean the area first. Let the first stream run. Only then collect, and stop before your bladder is empty. Do not touch the inside of the container.
Deliver it within two hours or keep it cold. In urine that stands, cells fall apart and bacteria keep growing.
Do you take a supplement with a lot of vitamin C? Mention it on the request form. It is a well-known reason for a falsely negative pad. The same goes for antibiotics you have just had.
In the days before, just drink as you normally would. Drinking a great deal dilutes your sample too much. Drinking almost nothing works the other way.
And do not look at this result alone. Only alongside nitrite, blood in urine and the culture do you get a complete picture.
These panels measure values from the same category as this marker.
A 45-biomarker heart health panel inspired by the WHOOP Heart Health Panel — an advanced look at cholesterol, lipoproteins, inflammation and kidney function.
A 43-biomarker comprehensive health panel inspired by WHOOP Advanced Labs — a deep look at metabolism, cardiovascular risk, hormones, liver, kidney and inflammation.
Comprehensive metabolic panel: electrolytes, kidney, liver, glucose, HbA1c, and protein.
Creatinine, eGFR, and BUN: key kidney markers.
Medical reviewer
Dr. Naimi oversees the medical standards behind our content and assessments.
Medical policyDoctor's Assessment Included
Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.