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There is not an all encompassing STD test. Each test is a little different for each STD. The doctor will determine what to test for.
A positive STD test means that the STD was present. If you have a positive test, you need treatment.
No; you don't need to fast for a STD test.
An STD would not affect the outcome of a paternity test.
Cold medicine does not affect the accuracy of an STD test.