How to check for lice?

Question

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How to check for lice? - briefly
Inspect the scalp by parting hair close to the skin and examining each section for live insects or their translucent eggs. Use a fine-tooth comb on wet hair, checking the comb after each pass for any nits or lice.

How to check for lice? - in detail
Detecting head lice requires a systematic approach that examines the scalp, hair, and surrounding skin. Begin by selecting a well‑lit, magnified environment; natural daylight or a bright lamp combined with a handheld magnifier improves visibility of nits and adult insects.

Preparation

Separate hair into sections of 2–3 cm using a fine‑toothed comb or a clean hair clip.
Dampen the hair lightly with water; a small amount of conditioner reduces tangles and allows the comb to glide smoothly.

Inspection technique

Run a fine lice comb from the scalp outward along each section, maintaining contact with the skin.
After each pass, wipe the comb on a white tissue or paper towel; examine for live insects, translucent eggs, or brownish shells.
Pay special attention to typical infestation zones: the nape of the neck, behind the ears, and the crown of the head.

Identification criteria

Live lice: brown or gray bodies, six legs, quick movement when disturbed.
Nits: oval, 0.8 mm long, firmly attached to the hair shaft within 1 cm of the scalp; color ranges from white to yellowish.
Shells: empty egg casings, similar shape but detached from the shaft and often lighter in color.

Verification

If any specimen is found, isolate it with tweezers and confirm species by shape and size.
Repeat the combing process three times over consecutive days; the presence of live insects on multiple occasions confirms an active infestation.

Documentation

Record the number and location of findings for each individual examined.
Note any recent contact with potentially infested persons or environments to guide further preventive measures.

A thorough examination, repeated over several days, ensures accurate detection and prevents false negatives caused by immature nits or low‑level infestations.