There's no such thing. The only time you know if you're resistant is if your viral load continues to go up and if your doctor orders what we call a genotype test. That will give you the ingredients that you are resistant to so that you can make a proper decision on which cocktail works for you.

Hopefully you are not continually infecting yourself by having unprotected sex with partners that you have no knowledge of their status. A change in meds is always the change made when your meds no longer protect you. It works both ways by being selective and doing what is right. Russian Roulette is a game we do not play when it comes to HIV.

your viral load has nothing to do with resistance. the resistance occurs when you just stop taking your meds. when you stop taking your meds, the virus mutates thus making you resistant.