Urine Test Strip - Urine Test Kits Latest Price ...
Instructions for Fentanyl Urine Test Strips. 1. Remove the test strip from the unopened pouch and use it promptly to get the best and most accurate results. Ideally, the test should be conducted within one hour after removing the test strip from the package. 2. Carefully hold the test strip by the end where you can see the product name.
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