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. 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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