AFTE Store - Validation of an Alternative Method for Creating the Positive Control Swabs for the Modified Griess Test

Examiners frequently found that the dried nitrite swabs used as the positive control in the Modified Griess Test were time consuming to prepare and gave a weak response. This study indicates that, rather than dry the swabs and rehydrate in acid, the nitrite can be directly dissolved in the acid and the swabs can be used fresh for each day of testing. In all cases, swabs prepared via the fresh method had a stronger and more rapid response than swabs prepared by the dried method.