What exactly is measured by the Nitric Oxide Indicator Strip?

We know that once nitric oxide is produced by the endothelial cells or other cells in the body, it is oxidized to nitrite and nitrate. The Nitric Oxide Diagnostics® Indicator Strips measure the amount of nitric oxide that is recirculated through the saliva. This measure represents the total systemic bioavailability of nitric oxide in your body at that time.