I have read on here that cocaine metabolites can be detected for 30days. at 240 pounds and 15 days since use what are chances of passing a lab test?

Really depends: There are several factors, the amount of Cocaine consumed and your metabolism is the prime consideration. If a urine screen is performed and your use was not high, then the maximum time of Cocaine metabolites are detected are several days to a week and at 15 days out you would likely test negative. If hair is tested, then you would test positive for at least two months.....

Good: You will pass a urine test. I hope you can get some more sober time.

Hard to know: It's hard to know how quickly you'll clear Cocaine metabolites from your system, since their presence in urine lengthens the more often and/or heavily you use. With single use, they may clear in 3-5 days; it takes longer in heavy users (.5gram or more): 8+ days. Other studies say 10-22 days, and as long as 30 days. If you're a heavy, frequent user, plan on the longer time frame.