Three different Candida antigen tests were studied in internal-surgical patients: two tests for Candida mannan antigen (C-Mannan-Dresden, Pastorex-Candida and Cand-Tec test for cytoplasmatic antigen. Most positive findings could be seen by both tests for mannan. In cases with increased occurrence of fungi in feces, sputum, urine, and mouth smears the tests differently became negative. Some clinical cases are discussed. With increased positivity of titer courses of all 3 antigen tests the probability of detection of an endomycosis also increased.