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Urine microscopy as screening method for bacteriuria

S Holm, A Wahlin, L Wahlqvist

    Acta Medica Scandinavica
    |May 1, 1982
    PubMed
    Summary
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    Microscopic examination of urine sediment for white blood cells (WBCs) can effectively screen for bacteriuria in patients with urological issues. A normal WBC count suggests no bacteria, while elevated levels indicate a high probability of infection.

    Area of Science:

    • Urology
    • Microbiology
    • Clinical Diagnostics

    Background:

    • Urological disorders can lead to urinary tract infections.
    • Accurate and efficient methods for diagnosing bacteriuria are crucial for patient management.

    Purpose of the Study:

    • To evaluate the utility of microscopic urine sediment examination for detecting bacteriuria in ambulatory patients with urological disorders.
    • To correlate white blood cell (WBC) counts in urine with the presence of bacteria.

    Main Methods:

    • Collected fresh urine samples from 90 ambulatory patients with urological disorders.
    • Quantified white blood cells (WBCs) per cubic millimeter (mm3) and per high power field (HPF) in urine sediment.
    • Cultured bacteria from urine samples to confirm bacteriuria.

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    Main Results:

    • Bacteria were cultured in 20 samples (22.2%).
    • 18 of these 20 positive cultures (90%) had >8 WBC/mm3.
    • Only 2 samples (3%) with ≤8 WBC/mm3 and 2 samples (3%) with 0-1 WBC/HPF contained bacteria.

    Conclusions:

    • Microscopic urine sediment examination for WBCs is a reliable screening tool for bacteriuria in urological patients.
    • A normal urinary WBC count (≤8/mm3) effectively rules out the presence of bacteria.
    • Leukocyturia strongly suggests a high probability of bacteriuria, warranting further investigation.