What does a urinalysis showing clear yellow urine, specific gravity 1.019, pH 5.5, negative glucose, bilirubin, ketones, blood, protein, nitrite, and leukocyte esterase, but microscopic 17 white‑blood‑cells per high‑power field and 11 red‑blood‑cells per high‑power field indicate?

Medical Advisory BoardAll articles are reviewed for accuracy by our Medical Advisory Board
Educational purpose only • Exercise caution as content is pending human review
Article Review Status
Submitted
Under Review
Approved

Last updated: November 7, 2026 • View editorial policy

Have a follow-up question?

Our Medical A.I. is used by practicing medical doctors at top research institutions around the world. Ask any follow up question and get world-class guideline-backed answers instantly.

Ask Question

Urinalysis Interpretation: Pyuria and Hematuria Without Infection

This urinalysis demonstrates significant pyuria (17 WBC/HPF) and microscopic hematuria (11 RBC/HPF) with negative dipstick markers for infection (negative nitrite and leukocyte esterase), indicating either a urinary tract infection with false-negative screening tests, sterile pyuria from non-infectious inflammation, or contamination—a urine culture is mandatory to distinguish these possibilities.

Key Findings Analysis

Microscopic Abnormalities Present

  • WBC count: 17/HPF (normal 0-4/HPF) - significantly elevated pyuria
  • RBC count: 11/HPF (normal 0-2/HPF) - microscopic hematuria
  • Squamous epithelial cells: 2/HPF - minimal, suggests adequate specimen collection

Discordant Dipstick Results

The critical discrepancy here is:

  • Negative leukocyte esterase despite 17 WBC/HPF on microscopy
  • Negative nitrite despite significant pyuria

Clinical Significance

Why the Discordance Matters

The negative leukocyte esterase with elevated microscopic WBCs represents a false-negative screening result. Leukocyte esterase typically becomes detectable at ≥15 WBC/HPF 1, so this result sits at the threshold. The sensitivity of leukocyte esterase is only 72-97% 1, meaning false-negatives occur in 3-28% of cases.

Microscopic examination has superior sensitivity (73-100%) compared to dipstick leukocyte esterase (83%) for detecting pyuria 1. Recent data confirms that WBC count on microscopic urinalysis demonstrates the highest diagnostic accuracy (AUC = 0.722) for predicting uropathogens, superior to leukocyte esterase (AUC = 0.700) 2.

Nitrite Limitations

Negative nitrite does not exclude UTI. Nitrite has poor sensitivity (19-53%) but excellent specificity (92-100%) 1. Nitrite requires:

  • Bacteria that convert nitrate to nitrite (not all uropathogens do this)
  • ≥4 hours of bladder dwell time for conversion 1
  • Adequate dietary nitrate intake

Diagnostic Algorithm

Immediate Next Steps

  1. Obtain urine culture with antimicrobial susceptibility testing 1

    • The combination of pyuria (17 WBC/HPF) makes UTI likely despite negative screening tests
    • Culture is the reference standard and cannot be replaced by urinalysis alone 1

  2. Assess clinical context:

    • Symptoms present (dysuria, frequency, urgency, fever, flank pain): Treat as presumptive UTI pending culture
    • Asymptomatic: Consider asymptomatic bacteriuria vs. sterile pyuria—do NOT treat empirically 3

Differential Diagnosis for Pyuria + Hematuria

With negative nitrite/leukocyte esterase, consider:

  • Urinary tract infection (most common)

    • False-negative screening tests
    • Non-nitrite-producing organisms (Enterococcus, Staphylococcus saprophyticus, Candida)

  • Sterile pyuria causes:

    • Interstitial nephritis
    • Urolithiasis (stones causing inflammation)
    • Genitourinary tuberculosis
    • Sexually transmitted infections (chlamydia, gonorrhea)
    • Recent antibiotic use (partially treated UTI)

  • Hematuria evaluation needed 4, 5

    • 11 RBC/HPF meets criteria for microhematuria (≥3 RBC/HPF) 4
    • If age >35, smoking history, or other risk factors: requires urologic evaluation including cystoscopy and imaging after infection excluded 4, 5

Critical Clinical Pitfalls

Do Not Rely on Dipstick Alone

Urinalysis cannot substitute for urine culture to document UTI 1. The presence of 17 WBC/HPF on microscopy overrides the negative leukocyte esterase result. Guidelines emphasize that both urinalysis suggesting infection (pyuria and/or bacteriuria) AND positive culture (≥50,000 CFU/mL) are required for UTI diagnosis 1.

Avoid Treating Asymptomatic Bacteriuria

If the patient is asymptomatic, the key distinction is presence of pyuria 1. Asymptomatic bacteriuria (positive culture without pyuria or symptoms) should NOT be treated in most patients, as treatment may cause more harm than good 1. However, this patient HAS pyuria, making true infection more likely.

Address the Hematuria

Do not ignore the microscopic hematuria 4, 5. After excluding/treating infection:

  • If hematuria persists on repeat testing, full urologic evaluation is indicated 4, 5
  • Risk factors for malignancy include: age >35, male gender, smoking, occupational chemical exposure, irritative voiding symptoms 4
  • Gross hematuria has 30-40% malignancy risk; microhematuria has 2.6-4% risk 4

Specimen Quality Considerations

The low squamous epithelial cell count (2/HPF) suggests minimal contamination, making the pyuria and hematuria more likely to represent true pathology rather than perineal contamination. Specific gravity of 1.019 is within normal range (1.003-1.030), and pH 5.5 is appropriate—neither factor significantly affects RBC detection 6.

References

4
Guideline

acr appropriateness criteria® hematuria.

Journal of the American College of Radiology, 2020

Related Questions

What does a urine analysis showing normal specific gravity, clear appearance, markedly alkaline pH (≥9), 1+ proteinuria, negative glucose, ketones, occult blood, nitrite, leukocyte esterase, no white or red blood cells, and only a few bacteria indicate, and how should it be managed?
How should I manage a patient whose urinalysis shows normal color and clarity, specific gravity 1.019, pH 5.5, no glucose, bilirubin, ketones, blood, protein, or nitrite, but microscopic 17 white blood cells per high‑power field and 11 red blood cells per high‑power field?
What does a positive leukocyte esterase on a urine dipstick indicate and how should it be managed in an otherwise healthy adult with urinary symptoms?
What is the significance of a urinalysis showing trace protein (~15 mg/dL) with negative leukocytes, nitrite, blood, ketones, bilirubin, glucose, normal pH (6.0) and specific gravity at the upper limit (1.030)?
What is the significance of cloudy urine with positive leukocyte esterase and blood on dipstick, and what is the appropriate treatment?
In a woman with normal estradiol levels and an undetectable progesterone level, what are the appropriate diagnostic and management steps?
What are the sensitivity and specificity of procalcitonin for distinguishing bacterial pneumonia from viral pneumonia?
What is the role of metronidazole in the treatment of bacterial meningitis?
Can you explain the phases and hormonal regulation of the menstrual cycle?
How should I manage a patient whose urinalysis shows normal color and clarity, specific gravity 1.019, pH 5.5, no glucose, bilirubin, ketones, blood, protein, or nitrite, but microscopic 17 white blood cells per high‑power field and 11 red blood cells per high‑power field?
What is diaphoresis?

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.