Synopsis
Select and collect high-yield skin, hair and nail specimens for microscopy and culture, interpret negative results cautiously, and protect patient and staff safety.
- Clean technique and correct site matter: collect scale from an active untreated border, affected nail from diseased depth, and abnormal hairs with roots or scalp scale.
- Direct microscopy can provide earlier evidence of fungal elements, while culture supports identification but may take weeks and can be negative after treatment.
- Stop or record recent topical and systemic antifungal exposure because it can reduce yield; never promise that a negative sample excludes infection.
- Label patient, precise anatomical site and specimen type at the bedside, then use the laboratory container and transport process specified locally.
- For Skin scraping, microscopy and culture, describe what is seen before assigning a diagnosis, and record site, extent, symptoms, duration and change over time.
- A technically adequate result in Skin scraping, microscopy and culture can still be misleading when the wrong lesion, site, preparation or clinical question was selected.
Key red flags
Do not delay same-day assessment for severe pain, rapidly spreading infection, sepsis, orbital involvement, immunocompromise with extensive disease, or inflammatory scalp disease causing scarring alopecia.
Patchy alopecia, scale, broken hairs or black dots suggests tinea capitis; boggy kerion needs prompt treatment to limit scarring.
Investigation priorities
Look rapidly for fungal hyphae, spores or yeast forms.
Management branches
The patient is stable and the result will alter diagnosis, referral or follow-up.
- Define the question for Skin scraping, microscopy and culture, explain the process and obtain valid consent before exposing, touching, photographing or sampling skin.
- Choose representative anatomy, optimise lighting or specimen technique, and document site, morphology, symptoms and relevant previous treatment. Apply that step specifically within the skin scraping, microscopy and culture assessment and its recorded clinical context.
- Interpret the result beside the full clinical pattern, communicate uncertainty and arrange ownership of results and safety-netting. Apply that step specifically within the skin scraping, microscopy and culture assessment and its recorded clinical context.