How can you independently detect lice? - briefly
Examine the scalp and hair closely, using a fine‑tooth comb on wet hair to reveal live insects or attached eggs within a millimetre of the scalp. Confirm presence by identifying oval, white nits firmly attached to hair shafts and active lice moving on the skin.
How can you independently detect lice? - in detail
Self‑assessment for head‑lice infestation relies on direct observation and tactile confirmation.
A systematic visual inspection begins with a well‑lit environment, preferably natural daylight or a bright lamp. The scalp should be examined in sections, starting at the hairline and moving toward the nape. Separate each strand with fingers or a fine‑tooth comb to expose the scalp surface. Look for live insects, which appear as gray‑brown, wingless bodies about the size of a sesame seed, and for eggs (nits) attached firmly to the hair shaft within a few millimetres of the scalp.
Tactile verification complements visual cues. Gently run fingertips along the hair shaft; live lice may be felt as small, moving bumps. Nits feel hard and immobile.
Specialized tools enhance detection accuracy:
- Fine‑tooth (lice) comb, spaced 0.2 mm apart, used on wet, conditioned hair; comb from scalp outward, wiping the comb on a white towel after each pass to reveal captured insects.
- Handheld magnifying glass (10×–20×) to enlarge suspect structures for precise identification.
- Adhesive tape strip, applied to a small scalp area, lifted and examined under magnification; useful for confirming the presence of eggs.
Commercial detection kits employ a similar principle: a disposable comb and a collection vial with a preservative solution. After combing, the vial is shaken, and the contents are inspected under a built‑in magnifier.
Interpretation of findings distinguishes infestation from normal hair debris: nits positioned less than 1 cm from the scalp and firmly cemented indicate active infestation; loose, translucent shells near the hair tip are likely hatched or shed. Live lice sightings confirm current infestation.
Precautions include avoiding excessive force that damages hair or scalp, washing hands after each examination, and disinfecting combs and tools between uses to prevent cross‑contamination.
Following these steps enables reliable, independent identification of head lice without professional assistance.