Well, yeast is pretty noticeable and has nothing to do with std's. If you ae getting screened for std's, they may overlook culturing for yeast. But the symptoms are typically there and otherwise, why are you paranoid about yeast? Not sure I understand that reaction. All women and many men get yeast overgrowth from time to time. Symptoms are itching, irritation and clumpy discharge. If you develop those symptoms, either go to the doctor for a swab to make sure and then treat or treat yourself with OTC products like Monostat. I like Monostat one day ovule, works well for me. good luck