Detection of antigen in serum and cerebrospinal fluid (CSF) has been a significant advance in the diagnosis of cryptococcosis, with a sensitivity and specificity for cryptococcal meningitis exceeding 95%.
Understanding cryptococcal antigen titer: The median serum CrAg titer is 1:16 among immunocompetent patients, or 1:32 among immunocompromised patients. (36354923)