The often overlooked second paragraph of NRS 202.257 states the following:
2. Any evidentiary test to determine whether a person has violated the provisions of subsection 1 must be administered in the same manner as an evidentiary test that is administered pursuant to NRS 484C.160 to 484C.250, inclusive, except that submission to the evidentiary test is required of any person who is directed by a police officer to submit to the test. If a person to be tested fails to submit to a required test as directed by a police officer, the officer may direct that reasonable force be used to the extent necessary to obtain the samples of blood from the person to be tested, if the officer has reasonable cause to believe that the person to be tested was in violation of this section.
IANAL, and as far as I know this hasn't been tested in court, so use reasonable caution, because the saying "you might beat the rap, you won't beat the ride" might just apply here. If you are drinking and OC, it's hard to say how a police officer might interpret the evidence, and may force you to submit to a blood test.
I have personally OC'd into PT's Pub and had 2 beers with a burger and fries. But I only did it once. Afterwards, I reconsidered my choice and felt it would be best to conceal at a bar or restaurant where I'm drinking. On the other hand, I will have a few beers in my front yard (when it's not so hot out), and I always enjoy at least one frosty brew when visiting my buddy's garage, and I don't have any reservations about OC then.
To answer you question more directly, like all choices to carry, it must be a personal choice, and you must decide for yourself. Under the law, you're legal to be in possession of a firearm as long as your BAC is less than 0.10. And if you're at home, you can be in possession of a firearm with any BAC.