Urine Toxicology Screen in Multiple Sleep Latency Test: The Correlation of Positive Tetrahydrocannabinol, Drug Negative Patients, and Narcolepsy

of EDS or were referred for management after a diagnosis of narcolepsy was made elsewhere without urine drug screening. Our hypothesis was that tetrahydrocannabinol (THC) use can cause symptoms like EDS and may also cause false (+) MSLT consistent with narcolepsy. We also hypothesized that symp-toms of narcolepsy, including EDS, cataplexy, sleep paralysis, or hypnagogic/hypnopompic hallucinations might be found in