Toluidine Blue Staining
Pronunciation: tol-YOO-ih-deen BLOO STAY-ning
A vital dye technique applied to oral mucosal lesions to highlight areas of increased nuclear density, aiding in the identification of dysplastic or malignant tissue.
Full Definition
Toluidine blue (also called tolonium chloride) is a metachromatic dye that binds preferentially to nucleic acids, staining dysplastic and malignant cells a darker blue than normal mucosa. In oral medicine, it is used as an adjunctive chairside screening tool for potentially malignant lesions, particularly leukoplakia and suspicious erythematous patches. A positive stain (retained blue colour after acetic acid decolorisation) indicates high nuclear activity but is not diagnostic alone; biopsy remains the gold standard. Editors must distinguish between 'toluidine blue' (the preferred clinical term) and colloquial variants such as 'tolonium stain'. Results are typically reported as positive, negative, or indeterminate.
Usage
Usage note: Write as 'toluidine blue staining' (lower case, unhyphenated) in running text; capitalise only at sentence start or in headings per journal style.
In Context
- "The clinician applied toluidine blue staining to the lesion before deciding whether biopsy was warranted." — Clinical case report
- "Toluidine blue staining yielded a positive result, prompting referral for histopathological examination." — Oral medicine referral letter