Urology Book


Urine Leukocyte Esterase

Aka: Urine Leukocyte Esterase
  1. Mechanism
    1. Neutrophil Granulocytes contain esterases
    2. Positive test suggests pyuria
      1. Dipstick requires 5 minutes to change color
  2. Normal
    1. Negative
  3. Abnormal: Positive
    1. Urinary Tract Infection
    2. Vaginal contaminant
  4. Causes: False NegativeLeukocyte esterase on Urinalysis
    1. Inadequate time allowed for dipstick reading
    2. Increased Urine Specific Gravity
    3. Urine Glucose present (Glycosuria)
    4. Urine Ketones present (Ketonuria)
    5. Proteinuria
    6. Keflex
    7. Nitrofurantoin
    8. Tetracycline
    9. Gentamicin
    10. Vitamin C
  5. Causes: Positive Leukocyte esterase and negative culture
    1. Chlamydia
    2. Ureaplasma urealyticum
    3. Balanitis
    4. Bladder Cancer
    5. Nephrolithiasis
    6. Tuberculosis
    7. Urinary tract foreign body
    8. Glomerulonephritis
    9. Medications (Corticosteroid, Cytoxan)
    10. Methenamine

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