What is urine strip test for dx of lithiasis?

Rapid detection of hematuria or UTI, any pt presenting sus acute renal colic, long-term care measures urine pH and follow-up. excellent test, sensitive enough detects leukocyturia >10^4/ml Nitrite detection indicates bacteria, threshold 10^5 Negative if no leukocyturia/bacteruria, risk for false negative very low (3%) but possible for nitrite case of low bacteriuria, nitrate restricted diet, infection by atypical bacteria not producing nitrite)