Is there a blood test for Nitric-oxide level or PDE5 levels, can doc order it?
Since Erection requires more of Nitric oxide and less of PDE5, is there a blood test for these?
Meds like Viagara/Cialis work by reducing PDE5 (aka PDE5-inhibitors), thereby increasing the effect of Nitric-oxide.
So measuring these in the body seems to make common sense, before one uses pills.
Are there tests like that? Can docs order it?