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Definition of Tzanck test
Medically reviewed by Min Clinic Staff | Updated: January 2026
Tzanck test: The examination of fluid from a bulla (a blister) in search of Tzanck cells characteristic of varicella (chickenpox), herpes zoster, herpes simplex, and pemphigus vulgaris. Named for a Russian dermatologist Arnault Tzanck (1886-1954).