I’m not quite sure if you are asking about routine testing or HIV window periods. Here is a bit of info on both:
When to get routine testing depends on things like whether you and your partners have other partners, whether condoms are used and how they are used. Click here for more information on when to get tested.
For HIV window periods, the virus is usually found in the blood within 3-6 weeks, but it can take up to 3 months. Click here for more information on HIV and testing.
Please leave a comment to let us know if this answers your question or if you need more info.