Lab

Urine Occult Blood

search

Urine Occult Blood, Urine Dipstick Blood, Urine Blood Test Strip

  • See Also
  1. Microscopic Hematuria
  2. Adult Microscopic Hematuria Causes
  3. Hematuria in Adults
  4. Hematuria in Children
  5. Gross Hematuria
  6. Urinalysis
  • Mechanism
  1. Dipstick detects RBC peroxidase activity
  • Interpretation
  • Normal
  1. Negative
  1. Dipstick blood must be confirmed with microscopic exam
  2. Dipstick detects blood down to 1-2 RBC/hpf
  3. See Microscopic Hematuria for confirmatory exam
    1. Diagnosis of Microscopic Hematuria: 3 RBCs/hpf
  4. Causes
    1. See Adult Microscopic Hematuria Causes
    2. See Hematuria in Children
  1. Dehydration
  2. Exercise
  3. Hemoglobinuria
  4. Myoglobinuria (e.g. Rhabdomyolysis)
  5. Non-urinary tract blood source (e.g. Menses, semen)
  6. Alkalotic urine (pH >9)
  7. Antiseptic solution
  1. Captopril
  2. Vitamin C supplementation (large intake)
  3. Increased Urine Specific Gravity
  4. Urine pH 5.0 or less
  5. Proteinuria
  • References
  1. Hitzeman (2022) Am Fam Physician 106(1): 27-35 [PubMed]
  2. Simerville (2005) Am Fam Physician 71(6): 1153-62 [PubMed]