As part of a national effort, Los Angeles County health officials have designated Friday and Saturday as HIV Testing Days at 69 clinics.
An estimated 16,000 Los Angeles County residents have HIV, the human immunodeficiency virus that causes AIDS, and do not know it, said Chuck Henry, director of the office of AIDS programs and policy in the county's Department of Health Services.
Testing is "very important now, particularly because there is so much good news for the treatment of HIV," Henry said.
Officials are using incentives, such as free movie passes and other gifts, to encourage those who are tested this week to return for results.
The free test includes counseling, and can be administered anonymously.
For clinic locations, call (800) 367-AIDS.