What type of opiate does stadol show up as on a urinalysis?

Stadol, which contains the active ingredient butorphanol, may show up as an opioid on a urinalysis. In standard drug tests, it could be detected as a general opiate or specifically as a synthetic opioid, depending on the testing method used. However, it may not always be specifically identified as butorphanol unless the test is designed to differentiate between various opioids.