3. Hold the blue end of your test and submerge the wavy close with the strip within the h2o for 15 seconds, retaining the liquid degree beneath the blue line  Re: Truly Freaked Out!! Fentanyl OD or W/D, Unsure! Need Assistance!! I'm a little concerned in your case. To me it looks like you may not be that opiod tolerant and also you are experiecin