The diagnosis of pediculosis capitis (head lice infestation) should rest on the discovery of a live nymphal or adult louse by personnel with appropriate expertise.[30][31] Nits that are within 6 mm from the scalp are usually viable and are highly suggestive of an active infestation.[3][4] A viable nit has a dark eyespot on microscopic examination.

BMJ Best Practice is an evidence-based point of care tool for healthcare practitioners.

To continue reading and access all of BMJ Best Practice's pages you'll need to log in or start a free trial.

You can access through your institution if your hospital, university, trust or other institution provides access to BMJ Best Practice through either OpenAthens or Shibboleth.

Use of this content is subject to our disclaimer