It's important to understand that the rapid HIV test is a screening test. If there is any reaction on the test additional blood will need to be taken to confirm HIV infection. Your doctor will be able to help guide you obtain these additional tests. http://melbournerapidhivtests.com.au
Any rapid HIV test that shows a reaction will need to have a confirmation test. This is an additional tube of blood that is sent for laboratory testing. Any gay friendly GP will be able to help you though this process.
If a rapid HIV test comes back positive it can mean that you have been infected with the HIV virus. Occasionally there are "false positives", this is when the rapid HIV test shows a positive result when the person has not been exposed to the HIV virus.