Blood tests are available for HIV, syphilis, and herpes but for no other common STD. Diagnosing chlamydia, gonorrhea, HPV/warts, vaginal infections, and most other STDs require taking samples from the infected areas.
For the STDs diagnosed by blood test, the health care provider has to ask for the test by name. Blood tests to check on general health--like a complete blood count or blood chemistry profile--don't pick up any STD.
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