Antifungal susceptibility testing (AST) comprises standardized assays that determine the in vitro activity of antifungal agents against yeasts and molds, informing therapy selection and resistance surveillance. With global mycotic disease incidence surpassing 1.7 bn episodes yr⁻¹ and resistance rates to azoles and echinocandins climbing above 15 % in several regions, reliable AST has become a critical stewardship tool. The antifungal susceptibility testing market size is estimated at USD 1.04 bn in 2025, up from USD 0.78 bn in 2021, translating to an 8.1 % CAGR over the historical period. Looking forward, industry expansion will be underpinned by a growth outlook of 9.4 % CAGR (2026-2033), lifted by escalating candidemia and aspergillosis caseloads, formulary pressure for precision antifungals, and new CLSI/EUCAST breakpoint updates that mandate routine MIC determination.