//fpnotebook.com/
Urine Nitrite
Aka: Urine Nitrite
- Mechanism
- Some Bacteria reduce nitrates to nitrites
- Nitrite production typically requires urine standing (in Bladder) for at least 4 hours
- Infants do not hold their urine, and do not typically demonstrate nitrite on the urine sample
- Efficacy
- Test Specificity: >91%
- Test Sensitivity: <49%
- Interpretation
- Normal: Negative
- Positive
- Urinary Tract Infection
- Gross Hematuria
- Causes: False Positive nitrite on Urinalysis
- Vaginal contaminant
- Phenazopyridine
- Dipstick exposed to air
- Close test strip containers immediately
- Strip exposed to air for 1 week: 33% False Positive
- Strip exposed to air for 2 weeks: 75% False Positive
- Causes: False Negative nitrite on Urinalysis
- Increased Urine Specific Gravity
- Increased Urobilinogen
- Bacteria lacking nitrate reductase enzyme
- Urine pH <6.0
- Vitamin C supplementation
- Low nitrate diet