Clinically Tested. Same Test Used by Most Doctors. Accurate Results in 2 minutes. Individually Wrapped. Take 2 Minutes to Check if it's a UTI. Use AZO Test Strips at the first sign of a UTI: pain, burning, needing to go more urgently (and more often). AZO Test Strips tests for 2 signs of a UTI: leukocytes (white blood cells) and nitrite. Healthy pee shouldn't have too many white blood cells or nitrites. FSC MIX Packaging. Recyclable packaging.