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
- 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
- Non-urinary tract blood source (e.g. Menses)
- Alkalotic urine (pH >9)
VI. Causes: False Negative occult blood on Urine Dipstick
- Captopril
- Vitamin C supplementation
- Increased Urine Specific Gravity
- Urine pH 5.0 or less
- Proteinuria