Urology Book

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Urine Occult Blood

Aka: Urine Occult Blood, Urine Dipstick Blood, Urine Blood Test Strip
  1. See Also
    1. Microscopic Hematuria
    2. Adult Microscopic Hematuria Causes
    3. Hematuria in Adults
    4. Hematuria in Children
    5. Gross Hematuria
    6. Urinalysis
  2. Mechanism
    1. Dipstick detects RBC peroxidase activity
  3. Interpretation: Normal
    1. Negative
  4. 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
    3. Causes
      1. See Adult Microscopic Hematuria Causes
      2. See Hematuria in Children
  5. 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)
  6. 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
  7. References
    1. Hitzeman (2022) Am Fam Physician 106(1): 27-35 [PubMed]
    2. Simerville (2005) Am Fam Physician 71(6): 1153-62 [PubMed]

Urine blood test strip (C0462947)

Concepts Medical Device (T074)
English Urine blood test strip
Sources
Derived from the NIH UMLS (Unified Medical Language System)


urine occult blood (C2188744)

Concepts Laboratory Procedure (T059)
English urine occult blood (lab test), occult blood, urine occult blood
Sources
Derived from the NIH UMLS (Unified Medical Language System)


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