Urine Test 2 Chapter 5 Study Guide Rated A+

Most common false negative reaction for the LE reagent test is: {Ans: Not waiting a full 2 minutes before reading}Several companies manufacture both positive and negative controls. Distilled water is not recommended as a negative control because ____ {Ans: reagent strip chemical reactions are designed to perform at ionic concentrations similar to urine}The _____ is less subject to interference and is more sensitive to bilirubin than ____ {Ans: Ictotest/reagent strips}_____ and _____ may lower the sensitivity of the test for bilirubin because they combine with the diazonium salt and prevent its reaction with bilirubin. {Ans: High concentrations of ascorbic acid and nitrite}The principle for the reagent strip test is___ {Ans: protein error of indicators certain indicators change color in the presence of protein even though the pH of the medium remains constant. This is because protein (primarily albumin) accepts hydrogen ions from the indicator. The test is more sensitive to albumin because albumin contains more amino groups to accept the hydrogen ions than other proteins.}Proper care of reagent strips should include: {Ans: 1. Store with dessicant (amber) in an opaque container (not clear) 2. Do not use past expiration date 3. Do not expose