Urology Book

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Urine Occult Blood

Aka: Urine Occult Blood, Urine Dipstick Blood
  1. See Also
    1. Microscopic Hematuria
    2. Adult Microscopic Hematuria Causes
    3. Hematuria in Adults
    4. Hematuria in Children
  2. Interpretation: Normal
    1. Negative
  3. Interpretation: Positive (Urine Dipstick with blood)
    1. Dipstick blood must be confirmed with microscopic exam
    2. See Microscopic Hematuria for confirmatory exam
      1. Diagnosis of Microscopic Hematuria: 3 RBCs/hpf
  4. Causes: False positive occult blood on Urine Dipstick
    1. Dehydration
    2. Exercise
    3. Hemoglobinuria
    4. Myoglobinuria
    5. Non-urinary tract blood source (e.g. Menses)
    6. Alkalotic urine (pH >9)
  5. Causes: False negative occult blood on Urine Dipstick
    1. Captopril
    2. Vitamin C supplementation
    3. Increased Urine Specific Gravity
    4. Urine pH 5.0 or less
    5. Proteinuria

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