[header] How to test nitric oxide levels [title] Buy nitric oxide test strips. [step] There are several brands of commercially-available test strips that measure the levels of nitric oxide found in the saliva. These levels are supposed to indicate how much circulatory nitric oxide is being produced in your body. 
Purchase these strips online, or at select pharmacies and health stores. [title] Place the test strip on your tongue for 5 seconds.