Tests for Leukocytes and Nitrite Fast & Easy UTI Home Test #1 Pharmacist Recommended Brand Clinically Tested! Individually Wrapped Easy to Use Results in Just 2 Minutes!AZO Test Strips can help detect if you have a urinary tract infection (UTI). This information will allow you to take an active role with your physician in the management of your health.AZO Test Strips use the same tests most doctors use. AZO Test Strips test for Leukocytes (white blood cells) and Nitrite for greater reliability than other tests.Use at the first sign of a UTI: Urinary pain, burning, urgency or frequency.