3. Hold the blue end of your test and submerge the wavy close of your strip during the h2o for 15 seconds, trying to keep the liquid amount below the blue line  Re: Definitely Freaked Out!! Fentanyl OD or W/D, Not sure! Require Tips!! I'm slightly anxious for you personally. To me it feels like you might not be that opiod tolerant so you are expe