However, a negative result four to eight weeks after taking a risk is a very good sign that HIV infection hasn’t happened.
But to be absolutely sure another test should be taken around eight weeks later; the testing centre will advise you.
Signs of HIV infection can’t be detected in the blood immediately.
It usually happens within four weeks of infection (sometimes longer).
They might want to find out why and might encourage you to tell your parent or carer.
But they should try to understand how you feel if you don’t want to.
This page is full of questions that young people have asked Doctor Ranj. Lots of young people see their doctor because they're worried about something, are feeling unwell or need treatment.
You can visit your doctor at any age, about any issue to do with your physical or mental health. There is no reason why you can’t ask to see the doctor by yourself.
Some GP’s also ask to see a proof of identity like a passport or proof of address like a mobile phone bill.
Antigens are present in large quantities in the early weeks after infection and then stop being detectable, whereas antibodies can take up to 12 weeks to be detectable and continue to be so.
If no sign of infection is found the test is ‘negative’. Someone who tests ‘positive’ has their blood tested a second time to be absolutely sure the result is accurate.
If you’re over the age of 16, you can register with a GP by yourself.
You can find a list of local GP’s in your area on the NHS website.