I was informed today that my surgery will finally happen after waiting for over 6 months. The doc is wanting a blood screening. I used a gram of cocaine 2 days ago with my girlfriend. I'm 6'2 about 250lbs, 32 yrs old, not in bad shape, but not in great shape. They want me to have this screening in about a week, but I can get it pushed to maybe 2 weeks. Will the cocaine or the benzoylecgonine show up in this screening. I'm not an avid user, and if I knew my surgery date finally came through I wouldn't have used at all. What are my chances of showing clean blood?

Cocaine or metabolites won't be detectable in blood or plasma at one week. Would still recommend waiting for 2.

Example:

Kobrich, 2006 (http://www.ncbi.nlm.nih.gov/pubmed/17132243)
Scheidweiler, 2010 (http://www.ncbi.nlm.nih.gov/pubmed/20814350)