"A diagnosis of HIV is made when CD4 T-lymphocytes drop to less than 30 cells/mm."

"A diagnosis of HIV is made when antibodies to HIV reach peak levels of 1000/ml of blood."

"A diagnosis of HIV is made when a patient tests positive for Syphilis."

"A diagnosis of HIV is made when antibodies to HIV are detected (seroconversion) about 6 weeks to 3 months following possible exposure."