Urine Leukocyte Esterase
Leukocyte esterase is an enzyme released by white blood cells in urine, and a positive dipstick indicates the presence of pyuria. Together with urine nitrite it is used to screen for urinary tract infection, though positive results can also occur with kidney inflammation, interstitial nephritis, and nearby pelvic or vaginal infections. A urine culture is used to confirm and identify the organism.
Optimal range: who says what
No institution or named practitioner we track states an optimal target for Urine Leukocyte Esterase. How we verify ranges.
- General guidance, no named sourceNegativeExpected in health; positive suggests urinary tract inflammation
- Lab reference intervalNegativeWhat a lab report flags against. A lab interval is not an optimal target.
4 providers include this
Urinalysis
Why Urine Leukocyte Esterase matters
An enzyme released by white blood cells. A positive test indicates WBCs in urine, suggesting urinary tract infection or inflammation. Often combined with nitrite testing to screen for bacterial UTI.
Reading a Urine Leukocyte Esterase result
Leukocyte esterase is a dipstick screen for a substance that signals white blood cells in urine. A positive result suggests a urinary tract infection and should be followed by microscopy for white cells (MedlinePlus).
Common causes of a high result
- A urinary tract infection
- Trichomonas infection
- Vaginal secretions in the sample, such as blood or heavy mucus
Caveat: High urine protein or high vitamin C can mask a positive result even when an infection is present (MedlinePlus).
What to check next
- Microscopic urinalysis for white cells
- Nitrite on the same strip
- A urine culture if infection is suspected
Sources: MedlinePlus: Leukocyte esterase urine test; MedlinePlus: Nitrites in urine. Checked against these sources 2026-09-23. General information, not medical advice; your lab's reference interval and your clinician's reading take precedence.
Which Providers Test Urine Leukocyte Esterase?
Empirical Health is both the cheapest ($190/year) and the most comprehensive (100+ biomarkers) panel that includes Urine Leukocyte Esterase.
4 panels that include it, cheapest first
| Provider | Annual Cost | Total Biomarkers | $/Biomarker |
|---|---|---|---|
| $190 | 100+ | $1.90 | |
| $297 | 100+ | $2.97 | |
| $365 | 100+ | $3.65 | |
| $499 | 100+ | $4.99 |
$/Biomarker is annual cost divided by the panel's advertised biomarker count, not the price of this one test. We track 23 blood test providers (32 plans); 21 of those plans are itemized marker by marker. Compare all of them.
17 itemized panels do not include Urine Leukocyte Esterase
Superpower · WHOOP Advanced Labs · Labcorp OnDemand · Life Extension Elite · Everlywell · InsideTracker · Function Health · Marek Health Base · Marek Health Comprehensive · Marek Health Complete · Marek Health Executive · Oura Health Panels · SiPhox Health · Hims Labs · Healthspan · Vitality Blueprint Standard · Vitality Blueprint Elite
11 providers not itemized in our matrix
We have not itemized these marker by marker (some sell tests one at a time), so this page cannot say whether they offer Urine Leukocyte Esterase. Check with them directly.
Life Extension Standard · Quest Health · Ultrahuman Blood Vision · Lifeforce · Hundred Health · Personalabs · Walk-In Lab · HealthLabs · WHOOP Specialized Panels · Marek Health Essential · Vitality Blueprint Upload
Frequently Asked Questions
What is the optimal range for Urine Leukocyte Esterase?
No institution or named practitioner we track states an optimal target for Urine Leukocyte Esterase. General guidance without a named source: Negative (Expected in health; positive suggests urinary tract inflammation). Lab reference interval: Negative. That is what a lab report flags against, not an optimal target.
Which blood test providers include Urine Leukocyte Esterase?
4 of the 21 blood testing panels we itemize marker by marker include Urine Leukocyte Esterase in their panels. This biomarker has limited availability.
Medical Disclaimer
This information is for educational purposes only and is not medical advice. Always consult with a qualified healthcare provider about your specific health needs.
Last reviewed Aug 26, 2026 · First published Nov 30, 2025