Tests for Narcolepsy

  • and behavior—for a period of time before the test. 
  • HLA typing. Many people with narcolepsy have a particular genetic marker related to the immune system. Testing for this genetic marker can be informative, but it is not a definitive test for narcolepsy, since some people without narcolepsy also have the marker.
  • Hypocretin level test. The chemical hypocretin (deficient in many cases of narcolepsy) can be measured in cerebrospinal fluid. Talk to your doctor about whether this test is indicated.