Which finding confirms oral candidiasis on microscopic examination?

Which finding confirms oral candidiasis on microscopic examination?

• A. Pseudohyphae or yeast buds on KOH prep
• B. Gram-positive cocci in clusters
• C. Multinucleated giant cells
• D. Spores on Gram stain

Answer: (A)

Visualizing budding yeast cells with pseudohyphae on a KOH preparation confirms oral candidiasis. Candida species characteristically appear as budding yeasts with short, branching pseudohyphae when the sample is treated with potassium hydroxide, which clears background debris and highlights fungal elements. This pattern is classic for Candida in oral thrush and helps distinguish it from bacterial infections (Gram-positive cocci in clusters) or viral-induced changes (such as multinucleated giant cells), which do not show budding yeasts with pseudohyphae. Therefore, finding pseudohyphae or yeast buds on a KOH prep is the hallmark microscopic confirmation of oral candidiasis.

Visualizing budding yeast cells with pseudohyphae on a KOH preparation confirms oral candidiasis. Candida species characteristically appear as budding yeasts with short, branching pseudohyphae when the sample is treated with potassium hydroxide, which clears background debris and highlights fungal elements. This pattern is classic for Candida in oral thrush and helps distinguish it from bacterial infections (Gram-positive cocci in clusters) or viral-induced changes (such as multinucleated giant cells), which do not show budding yeasts with pseudohyphae. Therefore, finding pseudohyphae or yeast buds on a KOH prep is the hallmark microscopic confirmation of oral candidiasis.