II. Mechanism
- Dipstick detects RBC peroxidase activity
III. Interpretation: Normal
- Negative
IV. Interpretation: Positive (Urine Dipstick with blood)
- Dipstick blood must be confirmed with microscopic exam
- Dipstick detects blood down to 1-2 RBC/hpf
- See Microscopic Hematuria for confirmatory exam
- Diagnosis of Microscopic Hematuria: 3 RBCs/hpf
- Causes
V. Causes: False Positive occult blood on Urine Dipstick
- Dehydration
- Exercise
- Hemoglobinuria
- Myoglobinuria (e.g. Rhabdomyolysis)
- Non-urinary tract blood source (e.g. Menses, semen)
- Alkalotic urine (pH >9)
- Antiseptic solution
VI. Causes: False Negative occult blood on Urine Dipstick (uncommon)
- Captopril
- Vitamin C supplementation (large intake)
- Increased Urine Specific Gravity
- Urine pH 5.0 or less
- Proteinuria
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Related Studies
Concepts | Medical Device (T074) |
English | Urine blood test strip |
Ontology: urine occult blood (C2188744)
Concepts | Laboratory Procedure (T059) |
English | urine occult blood (lab test), occult blood, urine occult blood |