Germ tube test is used in the diagnosis of
Candida albicans
Cryptococcus
Histoplasma
Coccidiomycosis
Candida albicans has the ability to form germ tubes within 2hrs when incubated in human serum at 37C. Ref: Textbook of Microbiology, Ananthanarayan and Paniker; 9th edition
mycology